It's possible to access a test room without the use a cheat device. To do this, the player must have all of Snide's HQ blueprints, then bring up any level in the Bonus menu, highlight any of the mini-games, then press and hold B, and quickly press A. If done correctly, the player will be taken into the test room itself. The room has no music, three pedestals, a yellow balloon, and a motionless clone of Donkey Kong. It's not possible to leave the room, as pressing Start does nothing and going off-screen will take that player back to the room.