diff --git a/docs/builds.md b/docs/builds.md
index e81f714b..f07a3251 100644
--- a/docs/builds.md
+++ b/docs/builds.md
@@ -21,6 +21,21 @@ Each platform is its own artifact: `hoppys-adventure-arcade-macos`, `-windows` a
 - **Windows** (x86_64): unzip and run `HoppysAdventureArcade.exe`. SmartScreen may ask you to confirm (**More info → Run anyway**), because the build isn't code-signed.
 - **Linux** (x86_64): unzip and run `./HoppysAdventureArcade.x86_64`.
 
+## Run it at a booth
+
+Launch with `--booth` to run an unattended kiosk. Arguments go after `--`; for a macOS app, use `open -a … --args …`.
+
+```sh
+./HoppysAdventureArcade.x86_64 -- --booth
+./HoppysAdventureArcade.x86_64 -- --booth --route=heroes_vs_villains
+open -a "Hoppy’s Adventure Arcade.app" --args -- --booth --route=heroes_vs_villains
+```
+
+- **Fullscreen.** The game starts fullscreen without changing the saved settings.
+- **Idle reset.** After 90 seconds with no keyboard, mouse, touch or controller input, any game returns to the hub, whose rotating previews act as the attract screen.
+- **No quitting from the menu.** The menu's **Quit Game** does nothing in booth mode; staff close the window (Cmd+Q, Alt+F4).
+- **Launch route.** `--route=<name>` opens a route at launch (`heroes_vs_villains`, `code_city_brawl`, `bay_area_blitz`, `orbital_ops`, `enchanted_repo`, `runner`, `platformer`, `beatem_up`, `hub`), with or without `--booth`. An unknown name logs an error and opens the hub.
+
 ## Build locally
 
 ```sh
diff --git a/hoppys-adventure-arcade/app/app_router.gd b/hoppys-adventure-arcade/app/app_router.gd
index ecba0b17..9f9a7eb2 100644
--- a/hoppys-adventure-arcade/app/app_router.gd
+++ b/hoppys-adventure-arcade/app/app_router.gd
@@ -15,8 +15,19 @@ const ROUTES := {
 ## nonzero on the first failure. tools/build/export_game.py runs it against each export.
 const SMOKE_FLAG := "--smoke-routes"
 const SMOKE_FRAMES := 30
+## Booth mode (`<game> -- --booth`) is for unattended kiosks: the game runs fullscreen, the menu's
+## Quit does nothing, and after IDLE_SECONDS without input any route returns to the hub, whose
+## rotating previews are the attract screen. `--route=<name>` opens a route at launch, with or
+## without --booth. Both are off unless passed.
+const BOOTH_FLAG := "--booth"
+const ROUTE_PREFIX := "--route="
+const IDLE_SECONDS := 90.0
+const STICK_DEADZONE := 0.4
 var busy := false
 var veil: ColorRect
+var booth := false
+var idle_limit := IDLE_SECONDS
+var idle_seconds := 0.0
 func _ready() -> void:
 	# The veil tween must keep running while a microgame has the tree paused.
 	process_mode = Node.PROCESS_MODE_ALWAYS
@@ -28,8 +39,14 @@ func _ready() -> void:
 	veil.mouse_filter = Control.MOUSE_FILTER_IGNORE
 	veil.modulate.a = 0
 	add_child(veil)
-	if SMOKE_FLAG in OS.get_cmdline_user_args():
+	var args := OS.get_cmdline_user_args()
+	if SMOKE_FLAG in args:
 		smoke_routes.call_deferred()
+		return
+	set_booth(BOOTH_FLAG in args)
+	var start := launch_route(args)
+	if start != "":
+		_launch.call_deferred(start)
 func go(route: String) -> void:
 	if busy or not ROUTES.has(route) or not ResourceLoader.exists(ROUTES[route]):
 		return
@@ -48,8 +65,15 @@ func go(route: String) -> void:
 	await create_tween().tween_property(veil, "modulate:a", 0.0, 0.25).finished
 	veil.mouse_filter = Control.MOUSE_FILTER_IGNORE
 	busy = false
-func quit_game() -> void:
+## Visitors can't quit a booth from the menu; staff close the window instead (force = true).
+## A forced quit wins even mid-transition: auto_accept_quit is off, so nothing else would close.
+func quit_game(force := false) -> void:
+	if booth and not force:
+		return
 	if busy:
+		if force:
+			AudioService.shutdown()
+			get_tree().quit()
 		return
 	busy = true
 	veil.mouse_filter = Control.MOUSE_FILTER_STOP
@@ -59,7 +83,47 @@ func quit_game() -> void:
 
 func _notification(what: int) -> void:
 	if what == NOTIFICATION_WM_CLOSE_REQUEST:
-		quit_game()
+		quit_game(true)
+
+## The route named by `--route=<name>`, or "" when absent or unknown (with an error for typos).
+static func launch_route(args: PackedStringArray) -> String:
+	for arg in args:
+		if arg.begins_with(ROUTE_PREFIX):
+			var route := arg.trim_prefix(ROUTE_PREFIX)
+			if ROUTES.has(route):
+				return route
+			push_error("Unknown --route %s; expected one of %s" % [route, ", ".join(ROUTES.keys())])
+	return ""
+
+func _launch(route: String) -> void:
+	await go(route)
+	var scene := get_tree().current_scene
+	var path := scene.scene_file_path if scene else "no scene"
+	print("AppRouter: launched route %s (%s)" % [route, path])
+
+func set_booth(enabled: bool) -> void:
+	booth = enabled
+	idle_seconds = 0.0
+	set_process(enabled)
+	set_process_input(enabled)
+	if enabled:
+		DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_FULLSCREEN)
+		print("AppRouter: booth mode on (idle return after %d s)" % int(idle_limit))
+
+func _input(event: InputEvent) -> void:
+	if event is InputEventKey or event is InputEventMouseButton or event is InputEventJoypadButton \
+			or event is InputEventScreenTouch \
+			or (event is InputEventJoypadMotion and absf(event.axis_value) > STICK_DEADZONE):
+		idle_seconds = 0.0
+
+func _process(delta: float) -> void:
+	idle_seconds += delta
+	if idle_seconds < idle_limit or busy:
+		return
+	idle_seconds = 0.0
+	var scene := get_tree().current_scene
+	if scene == null or scene.scene_file_path != ROUTES["hub"]:
+		go("hub")
 
 func smoke_routes() -> void:
 	# Let the launch scene finish its opening frames, as a player would, before switching.
diff --git a/hoppys-adventure-arcade/tests/booth_mode.gd b/hoppys-adventure-arcade/tests/booth_mode.gd
new file mode 100644
index 00000000..74c0ea34
--- /dev/null
+++ b/hoppys-adventure-arcade/tests/booth_mode.gd
@@ -0,0 +1,92 @@
+extends SceneTree
+## Booth mode: idle routes return to the hub, input keeps a game alive, the menu can't quit
+## the kiosk, and --route=<name> picks a launch route. The startup flags are checked by launching
+## the game as a child process, so _ready()'s own argument handling is covered.
+## Run headless with --script res://tests/booth_mode.gd.
+var failures := 0
+var router: Node
+
+func _initialize() -> void:
+	call_deferred("run")
+
+func check(ok: bool, message: String) -> void:
+	print("PASS: " if ok else "FAIL: ", message)
+	if not ok:
+		failures += 1
+
+func wait(seconds: float) -> void:
+	await create_timer(seconds, true).timeout
+
+func settle_route() -> void:
+	for i in 300:
+		if not router.busy:
+			break
+		await process_frame
+	await process_frame
+
+## Launch the game headless with user args for two simulated seconds (fixed 60 fps, so the
+## route fade always completes) and return its exit code and combined output.
+func launch(user_args: Array[String]) -> Dictionary:
+	var args: Array[String] = ["--headless", "--path", ProjectSettings.globalize_path("res://"),
+		"--fixed-fps", "60", "--quit-after", "120", "--"]
+	args.append_array(user_args)
+	var output: Array = []
+	var code := OS.execute(OS.get_executable_path(), args, output, true)
+	return {"code": code, "log": "\n".join(output)}
+
+func on_hub() -> bool:
+	return current_scene != null and current_scene.scene_file_path == router.ROUTES["hub"]
+
+func run() -> void:
+	router = root.get_node("AppRouter")
+	await wait(0.3)
+	check(not router.booth and not router.is_processing(), "Booth mode is off without --booth")
+
+	var launch: String = router.launch_route(PackedStringArray(["--route=heroes_vs_villains"]))
+	check(launch == "heroes_vs_villains", "--route names a launch route")
+	launch = router.launch_route(PackedStringArray(["--booth"]))
+	check(launch == "", "No --route means the default scene")
+
+	var plain := launch([])
+	check(plain.code == 0, "A plain launch exits cleanly")
+	check(not plain.log.contains("booth mode on") and not plain.log.contains("launched route"),
+		"A plain launch starts without booth mode or a launch route")
+	var kiosk := launch(["--booth", "--route=heroes_vs_villains"])
+	check(kiosk.code == 0, "A booth launch exits cleanly")
+	check(kiosk.log.contains("AppRouter: booth mode on"), "Launching with --booth turns booth mode on")
+	var opened: String = "AppRouter: launched route heroes_vs_villains (%s)" \
+		% router.ROUTES["heroes_vs_villains"]
+	check(kiosk.log.contains(opened), "Launching with --route opens that route's scene")
+
+	router.go("platformer")
+	await settle_route()
+	await wait(0.5)
+	check(not on_hub(), "Without booth mode an idle game stays put")
+
+	router.set_booth(true)
+	router.idle_limit = 0.6
+	check(router.booth and router.is_processing(), "set_booth enables the idle timer")
+	for i in 4:
+		await wait(0.25)
+		var key := InputEventKey.new()
+		key.physical_keycode = KEY_RIGHT
+		key.pressed = true
+		Input.parse_input_event(key)
+		Input.flush_buffered_events()
+	check(not on_hub(), "Input inside the idle window keeps the game running")
+
+	await wait(1.2)
+	await settle_route()
+	check(on_hub(), "An idle game returns to the hub's attract screen")
+
+	var before: int = router.get_child_count()
+	router.quit_game()
+	check(not router.busy and router.get_child_count() == before,
+		"The menu's Quit is ignored in booth mode")
+
+	router.set_booth(false)
+	router.idle_limit = router.IDLE_SECONDS
+	root.get_node("AudioService").shutdown()
+	await wait(0.4)
+	print("Booth mode failures: ", failures)
+	quit(1 if failures else 0)
diff --git a/hoppys-adventure-arcade/tests/booth_mode.gd.uid b/hoppys-adventure-arcade/tests/booth_mode.gd.uid
new file mode 100644
index 00000000..f72ff152
--- /dev/null
+++ b/hoppys-adventure-arcade/tests/booth_mode.gd.uid
@@ -0,0 +1 @@
+uid://c7s3s7spaejbm