diff --git a/scripts/smoke_test_main_menu_ui.gd b/scripts/smoke_test_main_menu_ui.gd
index 9195b4a..570e81c 100644
--- a/scripts/smoke_test_main_menu_ui.gd
+++ b/scripts/smoke_test_main_menu_ui.gd
@@ -1,9 +1,14 @@
 extends SceneTree
-## Verifies the main menu's Login/Register buttons actually open the auth
-## panel via a real signal emission (not calling the handler method
-## directly) -- that's the exact gap that shipped without ever being
-## caught: the AuthPanel and its logic were all correct, but nothing in
-## the scene was ever wired to open it.
+## Verifies the main menu's Login/Register buttons correctly open the auth
+## panel and toggle between Login and Register modes via signal emission.
+##
+## Key tests:
+##  - AuthPanel starts hidden.
+##  - LoginButton press opens the panel in Login mode.
+##  - RegisterButton press opens the panel in Register mode.
+##  - Clicking Login while in Register mode switches back to Login mode.
+##  - Clicking Register while in Login mode switches to Register mode.
+##  - The ModeToggle CheckButton no longer exists in the scene.
 
 
 func _initialize() -> void:
@@ -24,26 +29,87 @@ func _run() -> void:
 	var login_button: Button = instance.get_node("CenterContainer/VBoxContainer/AuthButtonsRow/LoginButton")
 	var register_button: Button = instance.get_node("CenterContainer/VBoxContainer/AuthButtonsRow/RegisterButton")
 	var auth_panel: PanelContainer = instance.get_node("CenterContainer/VBoxContainer/AuthPanel")
+	var auth_mode_label: Label = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthModeLabel")
+	var email_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/EmailEdit")
+	var dob_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/DOBEdit")
 
+	# --- Test 1: auth panel starts hidden ---
 	if _check("auth panel starts hidden", not auth_panel.visible):
 		passed += 1
 	else:
 		failed += 1
 
+	# --- Test 2: LoginButton press opens panel in Login mode ---
 	login_button.pressed.emit()
 	await process_frame
 
-	if _check("auth panel visible after a real LoginButton press signal", auth_panel.visible):
+	if _check("auth panel visible after LoginButton press", auth_panel.visible):
 		passed += 1
 	else:
 		failed += 1
 
-	# Reset and check RegisterButton independently too.
-	auth_panel.visible = false
+	if _check("Login mode label after LoginButton press", auth_mode_label.text == "Login"):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("Email field hidden in Login mode", not email_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("DOB field hidden in Login mode", not dob_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	# --- Test 3: RegisterButton press switches to Register mode ---
 	register_button.pressed.emit()
 	await process_frame
 
-	if _check("auth panel visible after a real RegisterButton press signal", auth_panel.visible):
+	if _check("auth panel still visible after RegisterButton press", auth_panel.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("Register mode label after RegisterButton press", auth_mode_label.text == "Register"):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("Email field visible in Register mode", email_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("DOB field visible in Register mode", dob_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	# --- Test 4: LoginButton press switches back to Login mode ---
+	login_button.pressed.emit()
+	await process_frame
+
+	if _check("Login mode label after second LoginButton press", auth_mode_label.text == "Login"):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("Email field hidden after switching back to Login", not email_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	if _check("DOB field hidden after switching back to Login", not dob_edit.visible):
+		passed += 1
+	else:
+		failed += 1
+
+	# --- Test 5: ModeToggle CheckButton no longer exists ---
+	var mode_toggle_path = "CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/ModeToggle"
+	var has_mode_toggle = instance.has_node(mode_toggle_path)
+	if _check("ModeToggle CheckButton removed from scene", not has_mode_toggle):
 		passed += 1
 	else:
 		failed += 1