Another pause. Then the menu changes. All previous options vanish. A single line remains:
Become immune to all incoming damage (though bottomless pits will still reset your position). ultrakill cheat menu
The menu grows.
Perhaps the best "cheat," this allows you to spawn any enemy or object anywhere, effectively turning any level into a custom arena for testing weapon combos. Utility: The Training Ground Another pause
The cheat menu offers a variety of tools that range from helpful training aids to absolute chaos: ultrakill cheat menu