I've discovered a code that can be entered at the title screen that enables debug mode. When the code is successfully entered, the "medal awarded" sound will be played with no visual indication. The code can only be entered while in freeplay mode. The 16-button code: Player 1 C, C, A, C, Player 2 A, A, C, A, Player 1 B, B, Player 2 B, B, C, Player 1 A, C, Player 2 C Debug mode adds some features that can be enabled with special inputs in-game. When the tilt DIP switch is on, the game stays paused unless player 1's start button is held down; this function won't be disabled if tilt is disabled while the game is running. The other features debug mode enables are activated with a press of a player's start button. Simply pressing start while in the invisible M-Roll will switch the stack between visible/invisible. While in-game in any mode, if right, left, up, or down is held first, and then start is pressed, the following happens: Right: The level is increased by 100, and only while a piece is active. Clearing a line after using this input will move you up to the level you selected. Locking the active piece without clearing lines after this input is used will cause the level to be set to x99, where x is your section (99, 199, 299, etc.). Left: The game immediately moves you to level 899, sets your grade to S8, and all prerequisites for getting Gm are set except the condition requiring grade S9 upon reaching level 900. (So, in practice, you can't get Gm using this) Up: The game immediately moves you to level 899, sets your grade to S9, and all prerequisites for getting Gm are set. Down: Switches forcing on/off 0.25G gravity regardless of level, except if the 20G code is enabled, or the game is in the normal mode M-Roll. Your score can still be added to the rankings while debug mode is enabled, but any new records set won't be saved after power-off. Once debug mode is enabled, there's no way to disable it other than a system reset.