diff --git a/levels/grunkbeast_test/grunkbeast_test.tscn b/levels/grunkbeast_test/grunkbeast_test.tscn
index da6473e..4fea237 100644
--- a/levels/grunkbeast_test/grunkbeast_test.tscn
+++ b/levels/grunkbeast_test/grunkbeast_test.tscn
@@ -1,7 +1,7 @@
 [gd_scene load_steps=11 format=3 uid="uid://cbxlfnlmgdvsq"]
 
 [ext_resource type="PackedScene" uid="uid://d2664rpg4losx" path="res://src/world/grunk_beast/grunk_beast.tscn" id="1_6yv42"]
-[ext_resource type="Script" uid="uid://bukihqt1lybnx" path="res://levels/grunkbeast_test/frame_skipper.gd" id="1_eco5q"]
+[ext_resource type="Script" uid="uid://bukihqt1lybnx" path="res://src/util/frame_skipper.gd" id="1_eco5q"]
 [ext_resource type="Script" uid="uid://cpt8dy0csa3eu" path="res://levels/grunkbeast_test/fixed_camera.gd" id="2_77sam"]
 
 [sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_goufh"]
diff --git a/levels/mechanic_test/mechanic_test.gd b/levels/mechanic_test/mechanic_test.gd
index 0e74a53..d53bf4c 100644
--- a/levels/mechanic_test/mechanic_test.gd
+++ b/levels/mechanic_test/mechanic_test.gd
@@ -10,10 +10,12 @@ extends Node3D
 @onready var nodule_spawn_point: Marker3D = %NoduleSpawnPoint
 @onready var alarm_spawn_point: Marker3D = %AlarmSpawnPoint
 @onready var signal_test_spawn_point: Marker3D = %SignalTestSpawnPoint
+@onready var prop_test_spawn_point: Marker3D = %PropTestSpawnPoint
 
 static var nodule_scene: PackedScene = load("res://src/world/gunk_node/grunk_nodule.tscn")
 static var alarm_scene: PackedScene = load("res://src/world/mechanics/alarm/gunk_alarm.tscn")
 static var signal_test_scene: PackedScene = load("res://levels/mechanic_test/signal_test.tscn")
+static var prop_test_scene: PackedScene = load("res://levels/mechanic_test/prop_test.tscn")
 
 
 func reset() -> void:
@@ -23,6 +25,7 @@ func reset() -> void:
 	Callable(open_switch, "enable").call()
 	Callable(close_switch, "disable").call()
 	_do_spawn(signal_test_spawn_point, signal_test_scene)
+	_do_spawn(prop_test_spawn_point, prop_test_scene)
 
 
 func _do_spawn(spawn_point: Node3D, scene: PackedScene) -> void:
@@ -41,6 +44,6 @@ func spawn_alarm() -> void:
 
 
 func trigger_spawned_alarm() -> void:
-	var alarm := alarm_spawn_point.get_child(0)
+	var alarm := alarm_spawn_point.get_child(0) as GunkAlarm
 	if alarm:
-		Callable(alarm, "trigger").call()
+		alarm.trigger()
diff --git a/levels/mechanic_test/mechanic_test.tscn b/levels/mechanic_test/mechanic_test.tscn
index b965c96..a001279 100644
--- a/levels/mechanic_test/mechanic_test.tscn
+++ b/levels/mechanic_test/mechanic_test.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=37 format=4 uid="uid://b8rv6dg4tgaeb"]
+[gd_scene load_steps=30 format=4 uid="uid://b8rv6dg4tgaeb"]
 
 [ext_resource type="Script" uid="uid://bvua1l2hb3an6" path="res://levels/mechanic_test/mechanic_test.gd" id="1_bg05n"]
 [ext_resource type="PackedScene" uid="uid://bwe2jdmvinhqd" path="res://src/player/player.tscn" id="1_goufh"]
@@ -9,6 +9,7 @@
 [ext_resource type="FastNoiseLite" uid="uid://cnlvdtx68giv6" path="res://assets/materials/gunk_noise.tres" id="6_x2vho"]
 [ext_resource type="PackedScene" uid="uid://dvma1hufsl6mc" path="res://src/props/bulkhead/bulkhead.tscn" id="8_0j1ke"]
 [ext_resource type="PackedScene" uid="uid://b5jubpjj3d277" path="res://levels/mechanic_test/signal_test.tscn" id="9_x2vho"]
+[ext_resource type="PackedScene" uid="uid://cfqirm2o3uo4k" path="res://levels/mechanic_test/prop_test.tscn" id="10_f342o"]
 
 [sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_goufh"]
 
@@ -127,85 +128,6 @@ shadow_mesh = SubResource("ArrayMesh_0j1ke")
 [sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_qjnj2"]
 data = PackedVector3Array(-1.5, 0, -6, -1.5, 0, 6, -1.5, 3, -6, -1.5, 3, -6, -1.5, 0, 6, -1.5, 3, 6, 1.5, 0, 6, 1.5, 0, -6, 1.5, 3, 6, 1.5, 3, 6, 1.5, 0, -6, 1.5, 3, -6, -1.5, 0, 6, -1.5, 0, -6, 1.5, 0, 6, 1.5, 0, 6, -1.5, 0, -6, 1.5, 0, -6, 1.5, 3, 6, 1.5, 3, -6, -1.5, 3, 6, -1.5, 3, 6, 1.5, 3, -6, -1.5, 3, -6)
 
-[sub_resource type="CompressedTexture2D" id="CompressedTexture2D_x2vho"]
-load_path = "res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"
-
-[sub_resource type="NoiseTexture3D" id="NoiseTexture3D_f342o"]
-width = 256
-height = 256
-depth = 32
-seamless = true
-seamless_blend_skirt = 0.5
-noise = ExtResource("6_x2vho")
-
-[sub_resource type="NoiseTexture3D" id="NoiseTexture3D_iyuyb"]
-width = 256
-height = 256
-depth = 32
-seamless = true
-seamless_blend_skirt = 0.5
-noise = ExtResource("6_x2vho")
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_qjnj2"]
-resource_local_to_scene = true
-render_priority = 0
-shader = ExtResource("5_0j1ke")
-shader_parameter/color_1 = Color(0, 0.03, 0.1, 1)
-shader_parameter/color_2 = Color(0, 0.1, 0.3, 1)
-shader_parameter/emission_color = Color(0.25, 0.88, 1, 1)
-shader_parameter/pixellation = 128.0
-shader_parameter/time_pixellation = 30.0
-shader_parameter/roughness = 0.15
-shader_parameter/specular_contribution = 0.8
-shader_parameter/emission_strength = 0.02
-shader_parameter/uv_scale = Vector2(4, 4)
-shader_parameter/time_scale = 0.2
-shader_parameter/edge_bleed = 0.25
-shader_parameter/gunk_mask = SubResource("CompressedTexture2D_x2vho")
-shader_parameter/gunk_noise = SubResource("NoiseTexture3D_f342o")
-shader_parameter/gunk_normal_map = SubResource("NoiseTexture3D_iyuyb")
-shader_parameter/jitter_magnitude = 0.0
-shader_parameter/jitter_time_scale = 0.1
-shader_parameter/vertex_inflation = 0.0
-shader_parameter/inflation_pixellation = 10.0
-
-[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_awnx0"]
-albedo_color = Color(1, 0.403922, 1, 1)
-
-[sub_resource type="ArrayMesh" id="ArrayMesh_cgmn0"]
-_surfaces = [{
-"aabb": AABB(-1, -1, -2.3, 2, 2, 2.4),
-"format": 34896613377,
-"index_count": 108,
-"index_data": PackedByteArray("AAABAAIAAgADAAAAAAADAAQAAgAFAAMAAgABAAUAAwAGAAQAAwAFAAYABAAHAAAAAAAHAAEABAAGAAcABwAIAAEABgAIAAcACQAFAAEAAQAIAAkACgAIAAYABgAFAAoACwAJAAgACwAIAAwADAAIAAoADQAJAAsADQAFAAkADAANAAsADgAFAA0ADgANAAwACgAFAA8ADwAFAA4ACgAPABAADgAMABEADAAKABIAEgAKABAAEQAMABIAEAAPABMADwAOABMAEAATABIAEwAOABEAEgATABEA"),
-"name": "Cube",
-"primitive": 3,
-"uv_scale": Vector4(0, 0, 0, 0),
-"vertex_count": 20,
-"vertex_data": PackedByteArray("AAD/////AAAAAJkZ//8AAAAA//+p6gAA/////6nqAAD///////8AAAAAmRmp6gAA//+ZGanqAAD//5kZ//8AAP//AAD//wAAAAAAAP//AAD//5kZVRUAAP//AAAAAAAA//+ZGQAAAAAAAAAAAAAAAAAAmRkAAAAAAACZGVUVAAD/////VRUAAAAA//8AAAAA/////wAAAAAAAP//VRUAAA==")
-}]
-blend_shape_mode = 0
-
-[sub_resource type="ArrayMesh" id="ArrayMesh_aix42"]
-_surfaces = [{
-"aabb": AABB(-1, -1, -2.3, 2, 2, 2.4),
-"attribute_data": PackedByteArray("S0tKSw6PSktLS9JSDo/SUpWWSkuVlqWlDo+lpQ6PHZ5LSx2eS0ulpQAA//8AADu8S0v//0tLO7xLS3f4Do93+EtL//8Oj///lZb//w6PLK0Oj6WllZalpUtLpaVLSyyt4eGHB+HhS0uVlocHlZZLS+Hh0lKVltJSlZb//5WWpaXh4f//4eGlpZWWAADh4QAAlZaHB+HhhwdLSzu8AAA7vEtL8HAAAPBwlZZZWpWW0lLh4Vla4eHSUpWWHZ7h4R2e4eGlpZWWpaXh4R2elZYdnktL8HAAAPBwS0stLQAALS0="),
-"format": 34896613399,
-"index_count": 108,
-"index_data": PackedByteArray("AAABAAIAAgABAAMABAADAAEABQADAAQABgADAAUABwADAAYABwAGAAgACAAGAAkACgALAAwADAALAA0ADgAPABAAEAAPABEADwASABEAEwASAA8AFAASABMAFQASABQAFAATABYAFgATABcAGAAZABoAGgAZABsAGQAcABsAGwAcAB0AHgAfACAAIAAfACEAIgAjACQAJAAjACUAJgAnACgAKAAnACkAKgArACwALAArAC0AKgAsAC4ALgAsAC8AMAAxADIAMgAxADMANAA1ADYANgA1ADcA"),
-"material": SubResource("StandardMaterial3D_awnx0"),
-"name": "Cube",
-"primitive": 3,
-"uv_scale": Vector4(0, 0, 0, 0),
-"vertex_count": 56,
-"vertex_data": PackedByteArray("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")
-}]
-blend_shape_mode = 0
-shadow_mesh = SubResource("ArrayMesh_cgmn0")
-
-[sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_x2vho"]
-data = PackedVector3Array(-1, 1, 0.1, -1, -0.8, 0.1, -1, 1, -0.1, -1, 1, -0.1, -1, -0.8, 0.1, -1, -0.8, -0.1, -1, -1, 0.1, -1, -0.8, -0.1, -1, -0.8, 0.1, -1, -1, -2.3, -1, -0.8, -0.1, -1, -1, 0.1, -1, -0.8, -2.3, -1, -0.8, -0.1, -1, -1, -2.3, -1, -0.8, -2.1, -1, -0.8, -0.1, -1, -0.8, -2.3, -1, -0.8, -2.1, -1, -0.8, -2.3, -1, 1, -2.1, -1, 1, -2.1, -1, -0.8, -2.3, -1, 1, -2.3, -1, 1, -0.1, -1, -0.8, -0.1, 1, 1, -0.1, 1, 1, -0.1, -1, -0.8, -0.1, 1, -0.8, -0.1, 1, 1, -0.1, 1, -0.8, -0.1, 1, 1, 0.1, 1, 1, 0.1, 1, -0.8, -0.1, 1, -0.8, 0.1, 1, -0.8, -0.1, 1, -1, 0.1, 1, -0.8, 0.1, 1, -0.8, -2.1, 1, -1, 0.1, 1, -0.8, -0.1, 1, -0.8, -2.3, 1, -1, 0.1, 1, -0.8, -2.1, 1, -1, -2.3, 1, -1, 0.1, 1, -0.8, -2.3, 1, -0.8, -2.3, 1, -0.8, -2.1, 1, 1, -2.3, 1, 1, -2.3, 1, -0.8, -2.1, 1, 1, -2.1, 1, 1, 0.1, 1, -0.8, 0.1, -1, 1, 0.1, -1, 1, 0.1, 1, -0.8, 0.1, -1, -0.8, 0.1, 1, -0.8, 0.1, 1, -1, 0.1, -1, -0.8, 0.1, -1, -0.8, 0.1, 1, -1, 0.1, -1, -1, 0.1, -1, -1, -2.3, -1, -1, 0.1, 1, -1, -2.3, 1, -1, -2.3, -1, -1, 0.1, 1, -1, 0.1, -1, 1, -0.1, 1, 1, -0.1, -1, 1, 0.1, -1, 1, 0.1, 1, 1, -0.1, 1, 1, 0.1, 1, -0.8, -0.1, -1, -0.8, -0.1, 1, -0.8, -2.1, 1, -0.8, -2.1, -1, -0.8, -0.1, -1, -0.8, -2.1, -1, -0.8, -2.3, -1, -1, -2.3, 1, -0.8, -2.3, 1, -0.8, -2.3, -1, -1, -2.3, 1, -1, -2.3, -1, -0.8, -2.3, 1, -0.8, -2.3, -1, 1, -2.3, -1, 1, -2.3, 1, -0.8, -2.3, 1, 1, -2.3, 1, 1, -2.1, -1, 1, -2.1, 1, 1, -2.3, 1, 1, -2.3, -1, 1, -2.1, -1, 1, -2.3, 1, -0.8, -2.1, -1, -0.8, -2.1, 1, 1, -2.1, 1, 1, -2.1, -1, -0.8, -2.1, -1, 1, -2.1)
-
 [node name="MechanicTest" type="Node3D"]
 script = ExtResource("1_bg05n")
 
@@ -363,20 +285,10 @@ transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 2.5, 0, -6)
 [node name="SignalTest" parent="SignalTestSpawnPoint" instance=ExtResource("9_x2vho")]
 
 [node name="PropTestSpawnPoint" type="Marker3D" parent="."]
+unique_name_in_owner = true
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -4.5, 0, 4.5)
 
-[node name="PropTest" type="Node3D" parent="PropTestSpawnPoint"]
-
-[node name="Parallel" parent="PropTestSpawnPoint/PropTest" instance=ExtResource("4_2uiim")]
-transform = Transform3D(-4.37114e-08, 1, 0, -1, -4.37114e-08, 0, 0, 0, 1, 0, 1, 1.5)
-mask_dim = 128
-source_gunk_material = SubResource("ShaderMaterial_qjnj2")
-
-[node name="MeshInstance3D" type="MeshInstance3D" parent="PropTestSpawnPoint/PropTest/Parallel"]
-mesh = SubResource("ArrayMesh_aix42")
-
-[node name="CollisionShape3D" type="CollisionShape3D" parent="PropTestSpawnPoint/PropTest/Parallel"]
-shape = SubResource("ConcavePolygonShape3D_x2vho")
+[node name="PropTest" parent="PropTestSpawnPoint" instance=ExtResource("10_f342o")]
 
 [connection signal="activated" from="ResetPodium/ResetSwitch" to="." method="reset"]
 [connection signal="activated" from="NoduleSpawner/WallSwitch" to="." method="spawn_nodule"]
diff --git a/levels/mechanic_test/prop_test.tscn b/levels/mechanic_test/prop_test.tscn
new file mode 100644
index 0000000..d69c667
--- /dev/null
+++ b/levels/mechanic_test/prop_test.tscn
@@ -0,0 +1,97 @@
+[gd_scene load_steps=12 format=4 uid="uid://cfqirm2o3uo4k"]
+
+[ext_resource type="PackedScene" uid="uid://c2omlx4ptrc01" path="res://src/world/gunk_body/gunk_body.tscn" id="1_cr8wn"]
+[ext_resource type="Shader" uid="uid://ckxc0ngd37rtk" path="res://src/shaders/gunk.gdshader" id="2_lrgpr"]
+[ext_resource type="FastNoiseLite" uid="uid://cnlvdtx68giv6" path="res://assets/materials/gunk_noise.tres" id="3_7477u"]
+
+[sub_resource type="CompressedTexture2D" id="CompressedTexture2D_x2vho"]
+load_path = "res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"
+
+[sub_resource type="NoiseTexture3D" id="NoiseTexture3D_f342o"]
+width = 256
+height = 256
+depth = 32
+seamless = true
+seamless_blend_skirt = 0.5
+noise = ExtResource("3_7477u")
+
+[sub_resource type="NoiseTexture3D" id="NoiseTexture3D_iyuyb"]
+width = 256
+height = 256
+depth = 32
+seamless = true
+seamless_blend_skirt = 0.5
+noise = ExtResource("3_7477u")
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_qjnj2"]
+resource_local_to_scene = true
+render_priority = 0
+shader = ExtResource("2_lrgpr")
+shader_parameter/color_1 = Color(0, 0.03, 0.1, 1)
+shader_parameter/color_2 = Color(0, 0.1, 0.3, 1)
+shader_parameter/emission_color = Color(0.25, 0.88, 1, 1)
+shader_parameter/pixellation = 128.0
+shader_parameter/time_pixellation = 30.0
+shader_parameter/roughness = 0.15
+shader_parameter/specular_contribution = 0.8
+shader_parameter/emission_strength = 0.02
+shader_parameter/uv_scale = Vector2(4, 4)
+shader_parameter/time_scale = 0.2
+shader_parameter/edge_bleed = 0.25
+shader_parameter/gunk_mask = SubResource("CompressedTexture2D_x2vho")
+shader_parameter/gunk_noise = SubResource("NoiseTexture3D_f342o")
+shader_parameter/gunk_normal_map = SubResource("NoiseTexture3D_iyuyb")
+shader_parameter/jitter_magnitude = 0.0
+shader_parameter/jitter_time_scale = 0.1
+shader_parameter/vertex_inflation = 0.0
+shader_parameter/inflation_pixellation = 10.0
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_awnx0"]
+albedo_color = Color(1, 0.403922, 1, 1)
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_cgmn0"]
+_surfaces = [{
+"aabb": AABB(-1, -1, -2.3, 2, 2, 2.4),
+"format": 34896613377,
+"index_count": 108,
+"index_data": PackedByteArray("AAABAAIAAgADAAAAAAADAAQAAgAFAAMAAgABAAUAAwAGAAQAAwAFAAYABAAHAAAAAAAHAAEABAAGAAcABwAIAAEABgAIAAcACQAFAAEAAQAIAAkACgAIAAYABgAFAAoACwAJAAgACwAIAAwADAAIAAoADQAJAAsADQAFAAkADAANAAsADgAFAA0ADgANAAwACgAFAA8ADwAFAA4ACgAPABAADgAMABEADAAKABIAEgAKABAAEQAMABIAEAAPABMADwAOABMAEAATABIAEwAOABEAEgATABEA"),
+"name": "Cube",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 20,
+"vertex_data": PackedByteArray("AAD/////AAAAAJkZ//8AAAAA//+p6gAA/////6nqAAD///////8AAAAAmRmp6gAA//+ZGanqAAD//5kZ//8AAP//AAD//wAAAAAAAP//AAD//5kZVRUAAP//AAAAAAAA//+ZGQAAAAAAAAAAAAAAAAAAmRkAAAAAAACZGVUVAAD/////VRUAAAAA//8AAAAA/////wAAAAAAAP//VRUAAA==")
+}]
+blend_shape_mode = 0
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_aix42"]
+_surfaces = [{
+"aabb": AABB(-1, -1, -2.3, 2, 2, 2.4),
+"attribute_data": PackedByteArray("S0tKSw6PSktLS9JSDo/SUpWWSkuVlqWlDo+lpQ6PHZ5LSx2eS0ulpQAA//8AADu8S0v//0tLO7xLS3f4Do93+EtL//8Oj///lZb//w6PLK0Oj6WllZalpUtLpaVLSyyt4eGHB+HhS0uVlocHlZZLS+Hh0lKVltJSlZb//5WWpaXh4f//4eGlpZWWAADh4QAAlZaHB+HhhwdLSzu8AAA7vEtL8HAAAPBwlZZZWpWW0lLh4Vla4eHSUpWWHZ7h4R2e4eGlpZWWpaXh4R2elZYdnktL8HAAAPBwS0stLQAALS0="),
+"format": 34896613399,
+"index_count": 108,
+"index_data": PackedByteArray("AAABAAIAAgABAAMABAADAAEABQADAAQABgADAAUABwADAAYABwAGAAgACAAGAAkACgALAAwADAALAA0ADgAPABAAEAAPABEADwASABEAEwASAA8AFAASABMAFQASABQAFAATABYAFgATABcAGAAZABoAGgAZABsAGQAcABsAGwAcAB0AHgAfACAAIAAfACEAIgAjACQAJAAjACUAJgAnACgAKAAnACkAKgArACwALAArAC0AKgAsAC4ALgAsAC8AMAAxADIAMgAxADMANAA1ADYANgA1ADcA"),
+"material": SubResource("StandardMaterial3D_awnx0"),
+"name": "Cube",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 56,
+"vertex_data": PackedByteArray("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")
+}]
+blend_shape_mode = 0
+shadow_mesh = SubResource("ArrayMesh_cgmn0")
+
+[sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_x2vho"]
+data = PackedVector3Array(-1, 1, 0.1, -1, -0.8, 0.1, -1, 1, -0.1, -1, 1, -0.1, -1, -0.8, 0.1, -1, -0.8, -0.1, -1, -1, 0.1, -1, -0.8, -0.1, -1, -0.8, 0.1, -1, -1, -2.3, -1, -0.8, -0.1, -1, -1, 0.1, -1, -0.8, -2.3, -1, -0.8, -0.1, -1, -1, -2.3, -1, -0.8, -2.1, -1, -0.8, -0.1, -1, -0.8, -2.3, -1, -0.8, -2.1, -1, -0.8, -2.3, -1, 1, -2.1, -1, 1, -2.1, -1, -0.8, -2.3, -1, 1, -2.3, -1, 1, -0.1, -1, -0.8, -0.1, 1, 1, -0.1, 1, 1, -0.1, -1, -0.8, -0.1, 1, -0.8, -0.1, 1, 1, -0.1, 1, -0.8, -0.1, 1, 1, 0.1, 1, 1, 0.1, 1, -0.8, -0.1, 1, -0.8, 0.1, 1, -0.8, -0.1, 1, -1, 0.1, 1, -0.8, 0.1, 1, -0.8, -2.1, 1, -1, 0.1, 1, -0.8, -0.1, 1, -0.8, -2.3, 1, -1, 0.1, 1, -0.8, -2.1, 1, -1, -2.3, 1, -1, 0.1, 1, -0.8, -2.3, 1, -0.8, -2.3, 1, -0.8, -2.1, 1, 1, -2.3, 1, 1, -2.3, 1, -0.8, -2.1, 1, 1, -2.1, 1, 1, 0.1, 1, -0.8, 0.1, -1, 1, 0.1, -1, 1, 0.1, 1, -0.8, 0.1, -1, -0.8, 0.1, 1, -0.8, 0.1, 1, -1, 0.1, -1, -0.8, 0.1, -1, -0.8, 0.1, 1, -1, 0.1, -1, -1, 0.1, -1, -1, -2.3, -1, -1, 0.1, 1, -1, -2.3, 1, -1, -2.3, -1, -1, 0.1, 1, -1, 0.1, -1, 1, -0.1, 1, 1, -0.1, -1, 1, 0.1, -1, 1, 0.1, 1, 1, -0.1, 1, 1, 0.1, 1, -0.8, -0.1, -1, -0.8, -0.1, 1, -0.8, -2.1, 1, -0.8, -2.1, -1, -0.8, -0.1, -1, -0.8, -2.1, -1, -0.8, -2.3, -1, -1, -2.3, 1, -0.8, -2.3, 1, -0.8, -2.3, -1, -1, -2.3, 1, -1, -2.3, -1, -0.8, -2.3, 1, -0.8, -2.3, -1, 1, -2.3, -1, 1, -2.3, 1, -0.8, -2.3, 1, 1, -2.3, 1, 1, -2.1, -1, 1, -2.1, 1, 1, -2.3, 1, 1, -2.3, -1, 1, -2.1, -1, 1, -2.3, 1, -0.8, -2.1, -1, -0.8, -2.1, 1, 1, -2.1, 1, 1, -2.1, -1, -0.8, -2.1, -1, 1, -2.1)
+
+[node name="PropTest" type="Node3D"]
+
+[node name="Parallel" parent="." instance=ExtResource("1_cr8wn")]
+transform = Transform3D(-4.37114e-08, 1, 0, -1, -4.37114e-08, 0, 0, 0, 1, 0, 1, 1.5)
+mask_dim = 128
+source_gunk_material = SubResource("ShaderMaterial_qjnj2")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="Parallel"]
+mesh = SubResource("ArrayMesh_aix42")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="Parallel"]
+shape = SubResource("ConcavePolygonShape3D_x2vho")
diff --git a/levels/mechanic_test/signal_test.tscn b/levels/mechanic_test/signal_test.tscn
index 33f5af0..f7aadce 100644
--- a/levels/mechanic_test/signal_test.tscn
+++ b/levels/mechanic_test/signal_test.tscn
@@ -1,4 +1,4 @@
-[gd_scene load_steps=19 format=3 uid="uid://b5jubpjj3d277"]
+[gd_scene load_steps=24 format=3 uid="uid://b5jubpjj3d277"]
 
 [ext_resource type="PackedScene" uid="uid://c2omlx4ptrc01" path="res://src/world/gunk_body/gunk_body.tscn" id="1_3u410"]
 [ext_resource type="Shader" uid="uid://ckxc0ngd37rtk" path="res://src/shaders/gunk.gdshader" id="2_tfbib"]
@@ -10,6 +10,7 @@
 [ext_resource type="PackedScene" uid="uid://dgqx1h4dtkwma" path="res://src/world/mechanics/trigger/gunk_trigger.tscn" id="8_gx82l"]
 [ext_resource type="PackedScene" uid="uid://bttust5ohud8e" path="res://src/world/mechanics/relay/gunk_relay.tscn" id="9_d4a3d"]
 [ext_resource type="PackedScene" uid="uid://dgeg3kkogm71m" path="res://src/world/mechanics/alarm/gunk_alarm.tscn" id="10_l8xa5"]
+[ext_resource type="PackedScene" uid="uid://d0j20q65wnqsr" path="res://src/world/mechanics/heart/gunk_heart.tscn" id="11_tfbib"]
 
 [sub_resource type="CompressedTexture2D" id="CompressedTexture2D_f342o"]
 load_path = "res://.godot/imported/debug_mask.png-fd2bc783338ed9439fe81a4eef9d86da.s3tc.ctex"
@@ -98,40 +99,149 @@ shadow_mesh = SubResource("ArrayMesh_ix0jw")
 [sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_x2vho"]
 data = PackedVector3Array(1.5, 0, 1.5, -1.5, 0, 1.5, 1.5, 0, -1.5, 1.5, 0, -1.5, -1.5, 0, 1.5, -1.5, 0, -1.5)
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_tfbib"]
+resource_local_to_scene = true
+render_priority = 0
+shader = ExtResource("2_tfbib")
+shader_parameter/color_1 = Color(0, 0.03, 0.1, 1)
+shader_parameter/color_2 = Color(0, 0.1, 0.3, 1)
+shader_parameter/emission_color = Color(0.25, 0.88, 1, 1)
+shader_parameter/pixellation = 128.0
+shader_parameter/time_pixellation = 30.0
+shader_parameter/roughness = 0.15
+shader_parameter/specular_contribution = 0.8
+shader_parameter/emission_strength = 0.02
+shader_parameter/uv_scale = Vector2(4, 4)
+shader_parameter/time_scale = 0.2
+shader_parameter/edge_bleed = 0.25
+shader_parameter/gunk_mask = SubResource("CompressedTexture2D_f342o")
+shader_parameter/gunk_noise = SubResource("NoiseTexture3D_iyuyb")
+shader_parameter/gunk_normal_map = SubResource("NoiseTexture3D_qjnj2")
+shader_parameter/jitter_magnitude = 0.0
+shader_parameter/jitter_time_scale = 0.1
+shader_parameter/vertex_inflation = 0.0
+shader_parameter/inflation_pixellation = 10.0
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_3u410"]
+resource_local_to_scene = true
+cull_mode = 2
+albedo_texture = ExtResource("4_r07l4")
+metallic = 1.0
+metallic_texture = ExtResource("5_67o2j")
+roughness_texture = ExtResource("7_c27im")
+normal_enabled = true
+normal_texture = ExtResource("6_4yjoq")
+texture_filter = 4
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_tfbib"]
+_surfaces = [{
+"aabb": AABB(-1.5, 0, -1.5, 3, 1e-05, 3),
+"format": 34896613377,
+"index_count": 6,
+"index_data": PackedByteArray(0, 0, 1, 0, 2, 0, 2, 0, 1, 0, 3, 0),
+"name": "Plane",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 4,
+"vertex_data": PackedByteArray(255, 255, 0, 0, 255, 255, 0, 0, 0, 0, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+}]
+blend_shape_mode = 0
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_e8utx"]
+_surfaces = [{
+"aabb": AABB(-1.5, 0, -1.5, 3, 1e-05, 3),
+"attribute_data": PackedByteArray(255, 255, 255, 255, 0, 0, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0),
+"format": 34896613399,
+"index_count": 6,
+"index_data": PackedByteArray(0, 0, 1, 0, 2, 0, 2, 0, 1, 0, 3, 0),
+"material": SubResource("StandardMaterial3D_3u410"),
+"name": "Plane",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 4,
+"vertex_data": PackedByteArray(255, 255, 0, 0, 255, 255, 255, 191, 0, 0, 0, 0, 255, 255, 255, 191, 255, 255, 0, 0, 0, 0, 255, 191, 0, 0, 0, 0, 0, 0, 255, 191, 255, 255, 255, 127, 255, 255, 255, 127, 255, 255, 255, 127, 255, 255, 255, 127)
+}]
+blend_shape_mode = 0
+shadow_mesh = SubResource("ArrayMesh_tfbib")
+
 [node name="SignalTest" type="Node3D"]
 
-[node name="Wall" parent="." instance=ExtResource("1_3u410")]
+[node name="TriggerNetWall" parent="." instance=ExtResource("1_3u410")]
 transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 1.5, 0)
 mask_dim = 64
 source_gunk_material = SubResource("ShaderMaterial_awnx0")
 
-[node name="MeshInstance3D" type="MeshInstance3D" parent="Wall"]
+[node name="MeshInstance3D" type="MeshInstance3D" parent="TriggerNetWall"]
 mesh = SubResource("ArrayMesh_xrfi2")
 
-[node name="CollisionShape3D" type="CollisionShape3D" parent="Wall"]
+[node name="CollisionShape3D" type="CollisionShape3D" parent="TriggerNetWall"]
 shape = SubResource("ConcavePolygonShape3D_x2vho")
 
-[node name="GunkTrigger" parent="." instance=ExtResource("8_gx82l")]
-transform = Transform3D(1, 0, 0, 0, 0.707107, -0.707107, 0, 0.707107, 0.707107, -1, 1.5, 0)
+[node name="GunkTrigger" parent="TriggerNetWall" instance=ExtResource("8_gx82l")]
+transform = Transform3D(1, 0, 0, 0, 0.707107, 0.707107, 0, -0.707107, 0.707107, -1, 0, 0)
 
-[node name="GunkRelay" parent="." instance=ExtResource("9_d4a3d")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.45, 2.1, 0)
+[node name="GunkRelay" parent="TriggerNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, -0.45, -2.62268e-08, -0.6)
 
-[node name="GunkRelay2" parent="." instance=ExtResource("9_d4a3d")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.15, 1.75, 0)
+[node name="GunkRelay2" parent="TriggerNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, -0.15, -1.09278e-08, -0.25)
 
-[node name="GunkRelay3" parent="." instance=ExtResource("9_d4a3d")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.2, 1.95, 0)
+[node name="GunkRelay3" parent="TriggerNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, 0.2, -1.96701e-08, -0.45)
 
-[node name="GunkRelay4" parent="." instance=ExtResource("9_d4a3d")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.2, 1.45, 0)
+[node name="GunkRelay4" parent="TriggerNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, 1, 0, -1, -4.37114e-08, 0.2, 2.18557e-09, 0.05)
 
-[node name="GunkAlarm" parent="." instance=ExtResource("10_l8xa5")]
-transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0.9, 1.75, 0)
+[node name="GunkAlarm" parent="TriggerNetWall" instance=ExtResource("10_l8xa5")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.9, -1.09278e-08, -0.25)
 
-[connection signal="destroyed" from="GunkTrigger" to="GunkRelay" method="trigger"]
-[connection signal="triggered" from="GunkRelay" to="GunkRelay2" method="trigger"]
-[connection signal="triggered" from="GunkRelay2" to="GunkRelay3" method="trigger"]
-[connection signal="triggered" from="GunkRelay2" to="GunkRelay4" method="trigger"]
-[connection signal="triggered" from="GunkRelay3" to="GunkAlarm" method="trigger"]
-[connection signal="triggered" from="GunkRelay4" to="GunkAlarm" method="trigger"]
+[node name="PulseNetWall" parent="." instance=ExtResource("1_3u410")]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 3.5, 1.5, 0)
+mask_dim = 64
+source_gunk_material = SubResource("ShaderMaterial_tfbib")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="PulseNetWall"]
+mesh = SubResource("ArrayMesh_e8utx")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="PulseNetWall"]
+shape = SubResource("ConcavePolygonShape3D_x2vho")
+
+[node name="GunkHeart" parent="PulseNetWall" instance=ExtResource("11_tfbib")]
+transform = Transform3D(0.4, 0, 0, 0, 0.282843, -0.282843, 0, 0.282843, 0.282843, 0, 4.37114e-08, 1)
+
+[node name="GunkRelay" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 2.18557e-08, 0.5)
+
+[node name="GunkRelay2" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.3, 8.74228e-09, 0.2)
+
+[node name="GunkRelay3" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.3, 8.74228e-09, 0.2)
+
+[node name="GunkRelay4" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -4.37114e-09, -0.1)
+
+[node name="GunkRelay5" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.3, -1.96701e-08, -0.45)
+
+[node name="GunkRelay6" parent="PulseNetWall" instance=ExtResource("9_d4a3d")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0.3, -1.96701e-08, -0.45)
+
+[node name="GunkAlarm" parent="PulseNetWall" instance=ExtResource("10_l8xa5")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -4.37114e-08, -1)
+
+[connection signal="destroyed" from="TriggerNetWall/GunkTrigger" to="TriggerNetWall/GunkRelay" method="trigger"]
+[connection signal="triggered" from="TriggerNetWall/GunkRelay" to="TriggerNetWall/GunkRelay2" method="trigger"]
+[connection signal="triggered" from="TriggerNetWall/GunkRelay2" to="TriggerNetWall/GunkRelay3" method="trigger"]
+[connection signal="triggered" from="TriggerNetWall/GunkRelay2" to="TriggerNetWall/GunkRelay4" method="trigger"]
+[connection signal="triggered" from="TriggerNetWall/GunkRelay3" to="TriggerNetWall/GunkAlarm" method="trigger"]
+[connection signal="triggered" from="TriggerNetWall/GunkRelay4" to="TriggerNetWall/GunkAlarm" method="trigger"]
+[connection signal="pulsed" from="PulseNetWall/GunkHeart" to="PulseNetWall/GunkRelay" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay" to="PulseNetWall/GunkRelay2" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay" to="PulseNetWall/GunkRelay3" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay2" to="PulseNetWall/GunkRelay4" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay3" to="PulseNetWall/GunkRelay4" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay4" to="PulseNetWall/GunkRelay5" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay4" to="PulseNetWall/GunkRelay6" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay5" to="PulseNetWall/GunkAlarm" method="pulse"]
+[connection signal="pulsed" from="PulseNetWall/GunkRelay6" to="PulseNetWall/GunkAlarm" method="pulse"]
diff --git a/levels/grunkbeast_test/frame_skipper.gd b/src/util/frame_skipper.gd
similarity index 100%
rename from levels/grunkbeast_test/frame_skipper.gd
rename to src/util/frame_skipper.gd
diff --git a/levels/grunkbeast_test/frame_skipper.gd.uid b/src/util/frame_skipper.gd.uid
similarity index 100%
rename from levels/grunkbeast_test/frame_skipper.gd.uid
rename to src/util/frame_skipper.gd.uid
diff --git a/src/world/mechanics/alarm/gunk_alarm.gd b/src/world/mechanics/alarm/gunk_alarm.gd
index ffd9df8..df52ade 100644
--- a/src/world/mechanics/alarm/gunk_alarm.gd
+++ b/src/world/mechanics/alarm/gunk_alarm.gd
@@ -1,12 +1,16 @@
-extends GunkNode
+class_name GunkAlarm extends GunkNode
 ## Raises the grunk alert when triggered.
 
 const ALERT_DELTA := 1
 
+## Time to wait for a pulse signal before triggering.
+@export var pulse_timeout := 6.0
+
 var _busy := false
 
 @onready var mesh_instance_3d: MeshInstance3D = %MeshInstance3D
 @onready var animation_player: AnimationPlayer = %AnimationPlayer
+@onready var pulse_listener_timer: Timer = %PulseListenerTimer
 
 
 ## Trigger this alarm.
@@ -19,6 +23,14 @@ func trigger() -> void:
 		animation_player.play("trigger")
 
 
+## Pulse this alarm, resetting the pulse countdown until triggering.
+##
+## Note that alarms will not begin the pulse countdown until receiving the first pulse.
+## On networks without a heart, the pulse timeout will be completely ignored.
+func pulse() -> void:
+	pulse_listener_timer.start(pulse_timeout)
+
+
 func _process(delta: float) -> void:
 	super._process(delta)
 	# TODO actual model & animation
@@ -26,6 +38,8 @@ func _process(delta: float) -> void:
 	var value := 1.0 - pct_damage()
 	material.albedo_color = Color(value, value, value)
 
+	# TODO pulse animation
+
 
 func _on_animation_finished(anim_name: StringName) -> void:
 	if anim_name == "trigger":
diff --git a/src/world/mechanics/alarm/gunk_alarm.tscn b/src/world/mechanics/alarm/gunk_alarm.tscn
index e5ae548..871d77e 100644
--- a/src/world/mechanics/alarm/gunk_alarm.tscn
+++ b/src/world/mechanics/alarm/gunk_alarm.tscn
@@ -82,4 +82,9 @@ libraries = {
 &"": SubResource("AnimationLibrary_b6er8")
 }
 
+[node name="PulseListenerTimer" type="Timer" parent="."]
+unique_name_in_owner = true
+one_shot = true
+
 [connection signal="animation_finished" from="AnimationPlayer" to="." method="_on_animation_finished"]
+[connection signal="timeout" from="PulseListenerTimer" to="." method="trigger"]
diff --git a/src/world/mechanics/heart/gunk_heart.gd b/src/world/mechanics/heart/gunk_heart.gd
new file mode 100644
index 0000000..70b34fa
--- /dev/null
+++ b/src/world/mechanics/heart/gunk_heart.gd
@@ -0,0 +1,21 @@
+extends GunkNode
+## Periodically emits a pulse.
+
+## Emitted at a regular interval.
+signal pulsed
+
+## Time in seconds between pulses.
+@export var interval := 3.0
+
+@onready var pulse_timer: Timer = %PulseTimer
+@onready var animation_player: AnimationPlayer = %AnimationPlayer
+
+
+func _ready() -> void:
+	pulse_timer.start(interval)
+
+
+func pulse() -> void:
+	# TODO animation
+	animation_player.play("pulse")
+	pulsed.emit()
diff --git a/src/world/mechanics/heart/gunk_heart.gd.uid b/src/world/mechanics/heart/gunk_heart.gd.uid
new file mode 100644
index 0000000..4d47dd5
--- /dev/null
+++ b/src/world/mechanics/heart/gunk_heart.gd.uid
@@ -0,0 +1 @@
+uid://d2k75cyykkk0s
diff --git a/src/world/mechanics/heart/gunk_heart.tscn b/src/world/mechanics/heart/gunk_heart.tscn
new file mode 100644
index 0000000..4ddf156
--- /dev/null
+++ b/src/world/mechanics/heart/gunk_heart.tscn
@@ -0,0 +1,137 @@
+[gd_scene load_steps=10 format=4 uid="uid://d0j20q65wnqsr"]
+
+[ext_resource type="Script" uid="uid://d2k75cyykkk0s" path="res://src/world/mechanics/heart/gunk_heart.gd" id="1_ftym0"]
+[ext_resource type="Script" uid="uid://bukihqt1lybnx" path="res://src/util/frame_skipper.gd" id="2_xgyvt"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_xgyvt"]
+albedo_color = Color(0, 0.0313726, 0.101961, 1)
+emission_enabled = true
+emission = Color(0.25098, 0.878431, 1, 1)
+emission_energy_multiplier = 0.0
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_eu6st"]
+_surfaces = [{
+"aabb": AABB(-0.894425, -1, -0.85064, 1.78885, 2, 1.70128),
+"format": 34896613377,
+"index_count": 60,
+"index_data": PackedByteArray("AAABAAIAAgABAAMAAQAAAAQAAwABAAUABQABAAQABAAAAAYABQAEAAcABwAEAAYAAwAFAAgACAAFAAcAAgADAAkACQADAAgAAAACAAoACgACAAkABgAAAAoACAAHAAsABwAGAAsACQAIAAsABgAKAAsACgAJAAsA"),
+"name": "Icosphere",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 12,
+"vertex_data": PackedByteArray("jOfBRhrPAAD/fwAA/38AAHJYwUb//wAAAADBRv9/AACM58FG5DAAAHJYwUYAAAAA//89uf9/AACMpz25AAAAAHIYPbnkMAAAchg9uRrPAACMpz25//8AAP9/////fwAA")
+}]
+blend_shape_mode = 0
+
+[sub_resource type="ArrayMesh" id="ArrayMesh_v3ru4"]
+_surfaces = [{
+"aabb": AABB(-0.894425, -1, -0.85064, 1.78885, 2, 1.70128),
+"attribute_data": PackedByteArray("0UWv14su//9FF6/XFl3//9FFr9dcdK/X//+v17no//9z0a/Xc9Gv1y26///ooq/X6KKv16KL//9cdK/XXHSv19FFr9cWXWCv0UWv10UXr9eLLmCv//+v13PRr9e56GCvc9Gv1+iir9ctumCv6KKv11x0r9eii2CvFl1gr9FFr9eLLmCviy5gr0UXr9cAAGCvuehgr3PRr9ctumCvLbpgr+iir9eii2Cvootgr1x0r9cWXWCvFl1gr4suYK/RRRGHiy5grwAAYK9FFxGHuehgry26YK9z0RGHLbpgr6KLYK/oohGHootgrxZdYK9cdBGH"),
+"format": 34896613399,
+"index_count": 60,
+"index_data": PackedByteArray("AAABAAIAAwAEAAUABgAHAAgACQAKAAsADAANAA4ADwAQABEAEgATABQAFQAWABcAGAAZABoAGwAcAB0AHgAfACAAIQAiACMAJAAlACYAJwAoACkAKgArACwALQAuAC8AMAAxADIAMwA0ADUANgA3ADgAOQA6ADsA"),
+"material": SubResource("StandardMaterial3D_xgyvt"),
+"name": "Icosphere",
+"primitive": 3,
+"uv_scale": Vector4(0, 0, 0, 0),
+"vertex_count": 60,
+"vertex_data": PackedByteArray("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")
+}]
+blend_shape_mode = 0
+shadow_mesh = SubResource("ArrayMesh_eu6st")
+
+[sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_ftym0"]
+data = PackedVector3Array(0.7236, -0.4472, 0.5257, 0, -1, 0, -0.2764, -0.4472, 0.8506, 0, -1, 0, 0.7236, -0.4472, 0.5257, 0.7236, -0.4472, -0.5257, -0.2764, -0.4472, 0.8506, 0, -1, 0, -0.8944, -0.4472, 0, -0.8944, -0.4472, 0, 0, -1, 0, -0.2764, -0.4472, -0.8506, -0.2764, -0.4472, -0.8506, 0, -1, 0, 0.7236, -0.4472, -0.5257, 0.7236, -0.4472, -0.5257, 0.7236, -0.4472, 0.5257, 0.8944, 0.4472, 0, 0.7236, -0.4472, 0.5257, -0.2764, -0.4472, 0.8506, 0.2764, 0.4472, 0.8506, -0.2764, -0.4472, 0.8506, -0.8944, -0.4472, 0, -0.7236, 0.4472, 0.5257, -0.8944, -0.4472, 0, -0.2764, -0.4472, -0.8506, -0.7236, 0.4472, -0.5257, -0.2764, -0.4472, -0.8506, 0.7236, -0.4472, -0.5257, 0.2764, 0.4472, -0.8506, 0.8944, 0.4472, 0, 0.7236, -0.4472, 0.5257, 0.2764, 0.4472, 0.8506, 0.2764, 0.4472, 0.8506, -0.2764, -0.4472, 0.8506, -0.7236, 0.4472, 0.5257, -0.7236, 0.4472, 0.5257, -0.8944, -0.4472, 0, -0.7236, 0.4472, -0.5257, -0.7236, 0.4472, -0.5257, -0.2764, -0.4472, -0.8506, 0.2764, 0.4472, -0.8506, 0.2764, 0.4472, -0.8506, 0.7236, -0.4472, -0.5257, 0.8944, 0.4472, 0, 0.8944, 0.4472, 0, 0.2764, 0.4472, 0.8506, 0, 1, 0, 0.2764, 0.4472, 0.8506, -0.7236, 0.4472, 0.5257, 0, 1, 0, -0.7236, 0.4472, 0.5257, -0.7236, 0.4472, -0.5257, 0, 1, 0, -0.7236, 0.4472, -0.5257, 0.2764, 0.4472, -0.8506, 0, 1, 0, 0.2764, 0.4472, -0.8506, 0.8944, 0.4472, 0, 0, 1, 0)
+
+[sub_resource type="Animation" id="Animation_eu6st"]
+resource_name = "pulse"
+step = 0.1
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("MeshInstance3D:scale")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1, 1, 1),
+"update": 0,
+"values": [Vector3(1, 1, 1), Vector3(1.05, 1.05, 1.05), Vector3(0.95, 0.95, 0.95), Vector3(1.15, 1.15, 1.15), Vector3(0.9, 0.9, 0.9), Vector3(1.025, 1.025, 1.025), Vector3(1, 1, 1)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("MeshInstance3D:mesh:surface_0/material:emission_energy_multiplier")
+tracks/1/interp = 2
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0, 0.3, 1),
+"transitions": PackedFloat32Array(1.618, 1.618, 1),
+"update": 0,
+"values": [0.0, 2.0, 0.0]
+}
+
+[sub_resource type="Animation" id="Animation_v3ru4"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("MeshInstance3D:scale")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(1, 1, 1)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("MeshInstance3D:mesh:surface_0/material:emission_energy_multiplier")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [0.0]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_kv3oi"]
+_data = {
+&"RESET": SubResource("Animation_v3ru4"),
+&"pulse": SubResource("Animation_eu6st")
+}
+
+[node name="GunkHeart" type="StaticBody3D"]
+collision_layer = 5
+collision_mask = 0
+script = ExtResource("1_ftym0")
+durability = 3.0
+value = 4000.0
+metadata/_custom_type_script = "uid://bypgxi0gy56yk"
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+mesh = SubResource("ArrayMesh_v3ru4")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("ConcavePolygonShape3D_ftym0")
+
+[node name="PulseTimer" type="Timer" parent="."]
+unique_name_in_owner = true
+
+[node name="FrameSkipper" type="Node" parent="."]
+script = ExtResource("2_xgyvt")
+frame_skip = 3
+metadata/_custom_type_script = "uid://bukihqt1lybnx"
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="FrameSkipper"]
+unique_name_in_owner = true
+root_node = NodePath("../..")
+libraries = {
+&"": SubResource("AnimationLibrary_kv3oi")
+}
+speed_scale = 4.0
+
+[connection signal="timeout" from="PulseTimer" to="." method="pulse"]
diff --git a/src/world/mechanics/relay/gunk_relay.gd b/src/world/mechanics/relay/gunk_relay.gd
index 3b838e9..1269f35 100644
--- a/src/world/mechanics/relay/gunk_relay.gd
+++ b/src/world/mechanics/relay/gunk_relay.gd
@@ -4,17 +4,59 @@ class_name GunkRelay extends GunkNode
 ## Emitted when `trigger` is called, after a short delay.
 signal triggered
 
+## Emitted when `pulse` is called, after a short delay.
+signal pulsed
+
+var _busy := false
+
 @onready var animation_player: AnimationPlayer = %AnimationPlayer
-@onready var rebroadcast_delay: Timer = %RebroadcastDelay
+@onready var trigger_delay: Timer = %TriggerDelay
+@onready var pulse_delay: Timer = %PulseDelay
 
 
 ## Trigger this relay.
 ##
 ## This will emit the `triggered` signal after a delay.
 func trigger() -> void:
-	animation_player.play("trigger")
-	rebroadcast_delay.start()
+	if not _busy:
+		_busy = true
+		animation_player.play("trigger")
+		trigger_delay.start()
 
 
-func _on_rebroadcast_delay_timeout() -> void:
+## Send a pulse through this relay.
+##
+## This will emit the `pulse` signal after a delay.
+func pulse() -> void:
+	if not _busy:
+		_busy = true
+		animation_player.play("pulse")
+		pulse_delay.start()
+
+
+func _on_trigger_delay_timeout() -> void:
 	triggered.emit()
+	_busy = false
+
+
+func _on_pulse_delay_timeout() -> void:
+	pulsed.emit()
+	_busy = false
+
+
+## Find a path to a target node through a GunkRelay network.
+static func find_path(
+	current: GunkRelay, target: GunkNode, visited: Array[GunkNode] = []
+) -> Array[GunkNode]:
+	# Depth-first search
+	for connection: Callable in current.triggered.get_connections():
+		var neighbor := connection.get_object() as GunkNode
+		if neighbor and not neighbor in visited:
+			if neighbor == target:
+				return [current, neighbor]
+			var relay := neighbor as GunkRelay
+			if relay:
+				var path := find_path(relay, target, visited + [current])
+				if path:
+					return [current] + path
+	return []
diff --git a/src/world/mechanics/relay/gunk_relay.tscn b/src/world/mechanics/relay/gunk_relay.tscn
index 12c6bf5..7bb5397 100644
--- a/src/world/mechanics/relay/gunk_relay.tscn
+++ b/src/world/mechanics/relay/gunk_relay.tscn
@@ -1,9 +1,11 @@
-[gd_scene load_steps=8 format=3 uid="uid://bttust5ohud8e"]
+[gd_scene load_steps=10 format=3 uid="uid://bttust5ohud8e"]
 
 [ext_resource type="Script" uid="uid://1oup50bp0pwd" path="res://src/world/mechanics/relay/gunk_relay.gd" id="1_rdv5j"]
+[ext_resource type="Script" uid="uid://bukihqt1lybnx" path="res://src/util/frame_skipper.gd" id="2_ipm58"]
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_gk1l0"]
 resource_local_to_scene = true
+albedo_color = Color(0, 0.0313726, 0.101961, 1)
 emission_enabled = true
 emission = Color(1, 0, 0, 1)
 emission_energy_multiplier = 0.0
@@ -31,6 +33,18 @@ tracks/0/keys = {
 "update": 0,
 "values": [0.0]
 }
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("MeshInstance3D:mesh:material:emission")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(1, 0, 0, 1)]
+}
 
 [sub_resource type="Animation" id="Animation_rdv5j"]
 resource_name = "trigger"
@@ -46,10 +60,51 @@ tracks/0/keys = {
 "update": 0,
 "values": [0.0, 2.0, 0.0]
 }
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("MeshInstance3D:mesh:material:emission")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(1, 0, 0, 1)]
+}
+
+[sub_resource type="Animation" id="Animation_nfkbq"]
+resource_name = "pulse"
+step = 0.1
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("MeshInstance3D:mesh:material:emission_energy_multiplier")
+tracks/0/interp = 2
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.166667, 1),
+"transitions": PackedFloat32Array(1, 1, 1),
+"update": 0,
+"values": [0.0, 2.0, 0.0]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("MeshInstance3D:mesh:material:emission")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(0.25098, 0.878431, 1, 1)]
+}
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_ipm58"]
 _data = {
 &"RESET": SubResource("Animation_ipm58"),
+&"pulse": SubResource("Animation_nfkbq"),
 &"trigger": SubResource("Animation_rdv5j")
 }
 
@@ -65,15 +120,28 @@ mesh = SubResource("SphereMesh_hsruj")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("SphereShape3D_gk1l0")
 
-[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
-unique_name_in_owner = true
-libraries = {
-&"": SubResource("AnimationLibrary_ipm58")
-}
-
-[node name="RebroadcastDelay" type="Timer" parent="."]
+[node name="TriggerDelay" type="Timer" parent="."]
 unique_name_in_owner = true
 wait_time = 0.2
 one_shot = true
 
-[connection signal="timeout" from="RebroadcastDelay" to="." method="_on_rebroadcast_delay_timeout"]
+[node name="PulseDelay" type="Timer" parent="."]
+unique_name_in_owner = true
+wait_time = 0.4
+one_shot = true
+
+[node name="FrameSkipper" type="Node" parent="."]
+script = ExtResource("2_ipm58")
+frame_skip = 3
+metadata/_custom_type_script = "uid://bukihqt1lybnx"
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="FrameSkipper"]
+unique_name_in_owner = true
+root_node = NodePath("../..")
+libraries = {
+&"": SubResource("AnimationLibrary_ipm58")
+}
+speed_scale = 4.0
+
+[connection signal="timeout" from="TriggerDelay" to="." method="_on_trigger_delay_timeout"]
+[connection signal="timeout" from="PulseDelay" to="." method="_on_pulse_delay_timeout"]
diff --git a/src/world/mechanics/trigger/gunk_trigger.tscn b/src/world/mechanics/trigger/gunk_trigger.tscn
index f2bfbd5..9b53e2d 100644
--- a/src/world/mechanics/trigger/gunk_trigger.tscn
+++ b/src/world/mechanics/trigger/gunk_trigger.tscn
@@ -45,7 +45,8 @@ data = PackedVector3Array(0.7236, -0.4472, 0.5257, 0, -1, 0, -0.2764, -0.4472, 0
 collision_layer = 5
 collision_mask = 0
 script = ExtResource("1_t1c4j")
-durability = 0.1
+durability = 3.0
+value = 4000.0
 metadata/_custom_type_script = "uid://bypgxi0gy56yk"
 
 [node name="MeshInstance3D" type="MeshInstance3D" parent="."]
diff --git a/src/world/mechanics/watchdog/gunk_watchdog.gd b/src/world/mechanics/watchdog/gunk_watchdog.gd
deleted file mode 100644
index 2379854..0000000
--- a/src/world/mechanics/watchdog/gunk_watchdog.gd
+++ /dev/null
@@ -1,23 +0,0 @@
-extends GunkNode
-## Triggers an alarm when connection to a target is lost.
-
-const TRIGGER_SIGNAL := "trigger"
-
-@export var entry_point: GunkRelay
-@export var target: GunkNode
-
-
-static func _build_path(current: GunkRelay, target: GunkNode) -> Array[GunkNode]:
-	for connection: Callable in current.triggered.get_connections():
-		var next_node := connection.get_object() as GunkNode
-		if next_node:
-			if next_node == target:
-				return [current, next_node]
-			var relay := next_node as GunkRelay
-			if relay:
-				var ret: Array[GunkNode] = [current]
-				# XXX
-				ret.append_array(_build_path(relay, target))
-				return ret
-
-	return []
diff --git a/src/world/mechanics/watchdog/gunk_watchdog.gd.uid b/src/world/mechanics/watchdog/gunk_watchdog.gd.uid
deleted file mode 100644
index 0e05f78..0000000
--- a/src/world/mechanics/watchdog/gunk_watchdog.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://uw4lx3ohj6s4
diff --git a/src/world/mechanics/watchdog/gunk_watchdog.tscn b/src/world/mechanics/watchdog/gunk_watchdog.tscn
deleted file mode 100644
index 1a6cb56..0000000
--- a/src/world/mechanics/watchdog/gunk_watchdog.tscn
+++ /dev/null
@@ -1,20 +0,0 @@
-[gd_scene load_steps=4 format=3 uid="uid://baavay05afcj8"]
-
-[ext_resource type="Script" uid="uid://uw4lx3ohj6s4" path="res://src/world/mechanics/watchdog/gunk_watchdog.gd" id="1_hr1mr"]
-
-[sub_resource type="SphereMesh" id="SphereMesh_hr1mr"]
-radius = 0.25
-height = 0.5
-
-[sub_resource type="SphereShape3D" id="SphereShape3D_lvqm8"]
-radius = 0.25
-
-[node name="GunkWatchdog" type="StaticBody3D"]
-script = ExtResource("1_hr1mr")
-metadata/_custom_type_script = "uid://bypgxi0gy56yk"
-
-[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
-mesh = SubResource("SphereMesh_hr1mr")
-
-[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
-shape = SubResource("SphereShape3D_lvqm8")