diff --git a/debug/debug_node2d.gd b/debug/debug_node2d.gd
new file mode 100644
index 0000000..d42c5d5
--- /dev/null
+++ b/debug/debug_node2d.gd
@@ -0,0 +1,9 @@
+extends Node2D
+class_name DebugNode2d, "res://addons/thunderk-basics/debug/debug_node2d.png"
+
+func _ready():
+	TKDebug.connect("active_changed", self, "_on_debug_active_changed")
+	_on_debug_active_changed()
+
+func _on_debug_active_changed():
+	set_visible(TKDebug.active)
diff --git a/debug/debug_node2d.png b/debug/debug_node2d.png
new file mode 100644
index 0000000..600db39
Binary files /dev/null and b/debug/debug_node2d.png differ
diff --git a/debug/debug_node2d.png.import b/debug/debug_node2d.png.import
new file mode 100644
index 0000000..5383a8f
--- /dev/null
+++ b/debug/debug_node2d.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/debug_node2d.png-9af8296c13fef1491514dd8ffc720d31.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://addons/thunderk-basics/debug/debug_node2d.png"
+dest_files=[ "res://.import/debug_node2d.png-9af8296c13fef1491514dd8ffc720d31.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/debug/debug_node2d.tscn b/debug/debug_node2d.tscn
new file mode 100644
index 0000000..0a3654d
--- /dev/null
+++ b/debug/debug_node2d.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://addons/thunderk-basics/debug/debug_node2d.gd" type="Script" id=1]
+
+[node name="debug" type="Node2D"]
+script = ExtResource( 1 )
diff --git a/debug/debug_node3d.gd b/debug/debug_node3d.gd
new file mode 100644
index 0000000..75d73f9
--- /dev/null
+++ b/debug/debug_node3d.gd
@@ -0,0 +1,9 @@
+extends Spatial
+class_name DebugNode3d, "res://addons/thunderk-basics/debug/debug_node3d.png"
+
+func _ready():
+	TKDebug.connect("active_changed", self, "_on_debug_active_changed")
+	_on_debug_active_changed()
+
+func _on_debug_active_changed():
+	set_visible(TKDebug.active)
diff --git a/debug/debug_node3d.png b/debug/debug_node3d.png
new file mode 100644
index 0000000..370bd5d
Binary files /dev/null and b/debug/debug_node3d.png differ
diff --git a/debug/debug_node3d.png.import b/debug/debug_node3d.png.import
new file mode 100644
index 0000000..d4163d1
--- /dev/null
+++ b/debug/debug_node3d.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/debug_node3d.png-36a7db45ad9e93eafb387b6f9eba2759.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://addons/thunderk-basics/debug/debug_node3d.png"
+dest_files=[ "res://.import/debug_node3d.png-36a7db45ad9e93eafb387b6f9eba2759.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0
diff --git a/debug/debug_node3d.tscn b/debug/debug_node3d.tscn
new file mode 100644
index 0000000..8881a43
--- /dev/null
+++ b/debug/debug_node3d.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://addons/thunderk-basics/debug/debug_node3d.gd" type="Script" id=1]
+
+[node name="debug" type="Spatial"]
+script = ExtResource( 1 )
diff --git a/debug/singleton.gd b/debug/singleton.gd
new file mode 100644
index 0000000..6265281
--- /dev/null
+++ b/debug/singleton.gd
@@ -0,0 +1,11 @@
+extends Node
+
+export var active = false
+
+signal active_changed
+
+func _process(delta):
+	# TODO disable in release builds
+	if Input.is_action_just_pressed("ui_debug"):
+		active = not active
+		emit_signal("active_changed")
diff --git a/thunderk-basics.gd b/thunderk-basics.gd
index 212c53f..ba9e691 100644
--- a/thunderk-basics.gd
+++ b/thunderk-basics.gd
@@ -1,2 +1,8 @@
 tool
 extends EditorPlugin
+
+func _enter_tree():
+	add_autoload_singleton("TKDebug", "res://addons/thunderk-basics/debug/singleton.gd")
+
+func _exit_tree():
+	remove_autoload_singleton("TKDebug")