diff --git a/dev-assets/doodads/azulian/azulian-red.js b/dev-assets/doodads/azulian/azulian-red.js
index a138408..f631e40 100644
--- a/dev-assets/doodads/azulian/azulian-red.js
+++ b/dev-assets/doodads/azulian/azulian-red.js
@@ -7,6 +7,7 @@ function main() {
 
 	var direction = "right";
 
+	Self.SetMobile(true);
 	Self.SetGravity(true);
 	Self.AddAnimation("walk-left", 100, ["red-wl1", "red-wl2", "red-wl3", "red-wl4"]);
 	Self.AddAnimation("walk-right", 100, ["red-wr1", "red-wr2", "red-wr3", "red-wr4"]);
diff --git a/dev-assets/doodads/azulian/azulian.js b/dev-assets/doodads/azulian/azulian.js
index 1599b48..a01881c 100644
--- a/dev-assets/doodads/azulian/azulian.js
+++ b/dev-assets/doodads/azulian/azulian.js
@@ -7,6 +7,7 @@ function main() {
 	var animStart = animEnd = 0;
 	var animFrame = animStart;
 
+	Self.SetMobile(true);
 	Self.SetGravity(true);
 	Self.SetHitbox(7, 4, 17, 28);
 	Self.AddAnimation("walk-left", 100, ["blu-wl1", "blu-wl2", "blu-wl3", "blu-wl4"]);
diff --git a/dev-assets/doodads/build.sh b/dev-assets/doodads/build.sh
index c50d5dd..5a72c6a 100755
--- a/dev-assets/doodads/build.sh
+++ b/dev-assets/doodads/build.sh
@@ -115,6 +115,33 @@ objects() {
 	doodad convert -t "Exit Flag" exit-flag.png exit-flag.doodad
 	doodad install-script exit-flag.js exit-flag.doodad
 
+	doodad convert -t "Start Flag" start-flag.png start-flag.doodad
+
+	cp *.doodad ../../../assets/doodads/
+
+	cd ../crumbly-floor
+
+	doodad convert -t "Crumbly Floor" floor.png shake1.png shake2.png \
+		fall1.png fall2.png fall3.png fall4.png fallen.png \
+		crumbly-floor.doodad
+	doodad install-script crumbly-floor.js crumbly-floor.doodad
+	cp *.doodad ../../../assets/doodads/
+
+	cd ..
+}
+
+onoff() {
+	cd on-off/
+
+	doodad convert -t "State Button" blue-button.png orange-button.png state-button.doodad
+	doodad install-script state-button.js state-button.doodad
+
+	doodad convert -t "State Block (Blue)" blue-on.png blue-off.png state-block-blue.doodad
+	doodad install-script state-block-blue.js state-block-blue.doodad
+
+	doodad convert -t "State Block (Orange)" orange-off.png orange-on.png state-block-orange.doodad
+	doodad install-script state-block-orange.js state-block-orange.doodad
+
 	cp *.doodad ../../../assets/doodads/
 
 	cd ..
@@ -126,5 +153,6 @@ doors
 trapdoors
 azulians
 objects
+onoff
 doodad edit-doodad -quiet -lock -author "Noah" ../../assets/doodads/*.doodad
 doodad edit-doodad -hide ../../assets/doodads/azu-blu.doodad
diff --git a/dev-assets/doodads/crumbly-floor/crumbly-floor.js b/dev-assets/doodads/crumbly-floor/crumbly-floor.js
new file mode 100644
index 0000000..155be86
--- /dev/null
+++ b/dev-assets/doodads/crumbly-floor/crumbly-floor.js
@@ -0,0 +1,60 @@
+// Crumbly Floor.
+function main() {
+	Self.SetHitbox(0, 0, 65, 7);
+
+	Self.AddAnimation("shake", 100, ["shake1", "shake2", "floor", "shake1", "shake2", "floor"]);
+	Self.AddAnimation("fall", 100, ["fall1", "fall2", "fall3", "fall4"]);
+
+	// Recover time for the floor to respawn.
+	var recover = 5000;
+
+	// States of the floor.
+	var stateSolid = 0;
+	var stateShaking = 1;
+	var stateFalling = 2;
+	var stateFallen = 3;
+	var state = stateSolid;
+
+	// Started the animation?
+	var startedAnimation = false;
+
+	Events.OnCollide(function(e) {
+		// Only trigger for mobile characters.
+		if (!e.Actor.IsMobile()) {
+			return;
+		}
+
+		// If the floor is falling, the player passes right thru.
+		if (state === stateFalling || state === stateFallen) {
+			return;
+		}
+
+		// Floor is solid until it begins to fall.
+		if (e.InHitbox && (state === stateSolid || state === stateShaking)) {
+			// Only activate when touched from the top.
+			if (e.Overlap.Y > 0) {
+				return false;
+			}
+
+			// Begin the animation sequence if we're in the solid state.
+			if (state === stateSolid) {
+				state = stateShaking;
+				Self.PlayAnimation("shake", function() {
+					state = stateFalling;
+					Self.PlayAnimation("fall", function() {
+						state = stateFallen;
+						Self.ShowLayerNamed("fallen");
+
+						// Recover after a while.
+						setTimeout(function() {
+							Self.ShowLayer(0);
+							state = stateSolid;
+						}, recover);
+					});
+				})
+			}
+
+			return false;
+		}
+	});
+}
diff --git a/dev-assets/doodads/crumbly-floor/fall1.png b/dev-assets/doodads/crumbly-floor/fall1.png
new file mode 100644
index 0000000..bc9710c
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/fall1.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall2.png b/dev-assets/doodads/crumbly-floor/fall2.png
new file mode 100644
index 0000000..1524b6d
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/fall2.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall3.png b/dev-assets/doodads/crumbly-floor/fall3.png
new file mode 100644
index 0000000..5b05d93
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/fall3.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fall4.png b/dev-assets/doodads/crumbly-floor/fall4.png
new file mode 100644
index 0000000..97e8ee0
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/fall4.png differ
diff --git a/dev-assets/doodads/crumbly-floor/fallen.png b/dev-assets/doodads/crumbly-floor/fallen.png
new file mode 100644
index 0000000..dd5e57f
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/fallen.png differ
diff --git a/dev-assets/doodads/crumbly-floor/floor.png b/dev-assets/doodads/crumbly-floor/floor.png
new file mode 100644
index 0000000..f89f16e
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/floor.png differ
diff --git a/dev-assets/doodads/crumbly-floor/shake1.png b/dev-assets/doodads/crumbly-floor/shake1.png
new file mode 100644
index 0000000..4881adf
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/shake1.png differ
diff --git a/dev-assets/doodads/crumbly-floor/shake2.png b/dev-assets/doodads/crumbly-floor/shake2.png
new file mode 100644
index 0000000..42e770d
Binary files /dev/null and b/dev-assets/doodads/crumbly-floor/shake2.png differ
diff --git a/dev-assets/doodads/doors/electric-door.js b/dev-assets/doodads/doors/electric-door.js
index d424ba3..9aa75af 100644
--- a/dev-assets/doodads/doors/electric-door.js
+++ b/dev-assets/doodads/doors/electric-door.js
@@ -23,8 +23,8 @@ function main() {
 			});
 		} else {
 			animating = true;
-			opened = false;
 			Self.PlayAnimation("close", function() {
+				opened = false;
 				animating = false;
 			})
 		}
diff --git a/dev-assets/doodads/objects/start-flag.png b/dev-assets/doodads/objects/start-flag.png
new file mode 100644
index 0000000..125550e
Binary files /dev/null and b/dev-assets/doodads/objects/start-flag.png differ
diff --git a/dev-assets/doodads/on-off/blue-button.png b/dev-assets/doodads/on-off/blue-button.png
new file mode 100644
index 0000000..184627a
Binary files /dev/null and b/dev-assets/doodads/on-off/blue-button.png differ
diff --git a/dev-assets/doodads/on-off/blue-off.png b/dev-assets/doodads/on-off/blue-off.png
new file mode 100644
index 0000000..6275e2b
Binary files /dev/null and b/dev-assets/doodads/on-off/blue-off.png differ
diff --git a/dev-assets/doodads/on-off/blue-on.png b/dev-assets/doodads/on-off/blue-on.png
new file mode 100644
index 0000000..e200231
Binary files /dev/null and b/dev-assets/doodads/on-off/blue-on.png differ
diff --git a/dev-assets/doodads/on-off/orange-button.png b/dev-assets/doodads/on-off/orange-button.png
new file mode 100644
index 0000000..ec5ef16
Binary files /dev/null and b/dev-assets/doodads/on-off/orange-button.png differ
diff --git a/dev-assets/doodads/on-off/orange-off.png b/dev-assets/doodads/on-off/orange-off.png
new file mode 100644
index 0000000..1ce8f1e
Binary files /dev/null and b/dev-assets/doodads/on-off/orange-off.png differ
diff --git a/dev-assets/doodads/on-off/orange-on.png b/dev-assets/doodads/on-off/orange-on.png
new file mode 100644
index 0000000..c56e09e
Binary files /dev/null and b/dev-assets/doodads/on-off/orange-on.png differ
diff --git a/dev-assets/doodads/on-off/state-block-blue.js b/dev-assets/doodads/on-off/state-block-blue.js
new file mode 100644
index 0000000..0b287e3
--- /dev/null
+++ b/dev-assets/doodads/on-off/state-block-blue.js
@@ -0,0 +1,28 @@
+// Blue State Block
+function main() {
+	Self.SetHitbox(0, 0, 33, 33);
+
+	// Blue block is ON by default.
+	var state = true;
+
+	Message.Subscribe("broadcast:state-change", function(newState) {
+		state = !newState;
+		console.warn("BLUE BLOCK Received state=%+v, set mine to %+v", newState, state);
+
+		// Layer 0: ON
+		// Layer 1: OFF
+		if (state) {
+			Self.ShowLayer(0);
+		} else {
+			Self.ShowLayer(1);
+		}
+	});
+
+	Events.OnCollide(function(e) {
+		if (e.Actor.IsMobile() && e.InHitbox) {
+			if (state) {
+				return false;
+			}
+		}
+	});
+}
diff --git a/dev-assets/doodads/on-off/state-block-orange.js b/dev-assets/doodads/on-off/state-block-orange.js
new file mode 100644
index 0000000..634d5e8
--- /dev/null
+++ b/dev-assets/doodads/on-off/state-block-orange.js
@@ -0,0 +1,28 @@
+// Orange State Block
+function main() {
+	Self.SetHitbox(0, 0, 33, 33);
+
+	// Orange block is OFF by default.
+	var state = false;
+
+	Message.Subscribe("broadcast:state-change", function(newState) {
+		state = newState;
+		console.warn("ORANGE BLOCK Received state=%+v, set mine to %+v", newState, state);
+
+		// Layer 0: OFF
+		// Layer 1: ON
+		if (state) {
+			Self.ShowLayer(1);
+		} else {
+			Self.ShowLayer(0);
+		}
+	});
+
+	Events.OnCollide(function(e) {
+		if (e.Actor.IsMobile() && e.InHitbox) {
+			if (state) {
+				return false;
+			}
+		}
+	});
+}
diff --git a/dev-assets/doodads/on-off/state-button.js b/dev-assets/doodads/on-off/state-button.js
new file mode 100644
index 0000000..51a2af3
--- /dev/null
+++ b/dev-assets/doodads/on-off/state-button.js
@@ -0,0 +1,47 @@
+// State Block Control Button
+function main() {
+	console.log("%s initialized!", Self.Doodad.Title);
+	Self.SetHitbox(0, 0, 33, 33);
+
+	// When the button is activated, don't keep toggling state until we're not
+	// being touched again.
+	var colliding = false;
+
+	// Button is "OFF" by default.
+	var state = false;
+
+	Events.OnCollide(function(e) {
+		if (colliding) {
+			return false;
+		}
+
+		// Only trigger for mobile characters.
+		if (e.Actor.IsMobile()) {
+			console.log("Mobile actor %s touched the on/off button!", e.Actor.Actor.Filename);
+
+			// Only activate if touched from the bottom or sides.
+			if (e.Overlap.Y === 0) {
+				console.log("... but touched the top!");
+				return false;
+			}
+
+			colliding = true;
+			console.log("   -> emit state change");
+			state = !state;
+			Message.Broadcast("broadcast:state-change", state);
+
+			if (state) {
+				Self.ShowLayer(1);
+			} else {
+				Self.ShowLayer(0);
+			}
+		}
+
+		// Always a solid button.
+		return false;
+	});
+
+	Events.OnLeave(function(e) {
+		colliding = false;
+	})
+}