Tetris DX

Hold Left until a piece touches the wall. Continue to hold d-pad Left and rapidly tap A. Alternately, hold Right and rapidly tap B. (Note: Cheat does not work on symmetrical pieces like the square and straight bar.)

Press Start to pause game. Then turn Game Boy off. When the unit is turned on again, a “Continue” screen will appear.

Press Start during game. Then press Select. The preview window will not display the next piece when game resumes.

Press Start + Select + A + B during game.

Move the block to either side of the screen. If on the left, press the "B" button repeatedly. If on the right, press the "A" button repeatedly and your blocks will move upward.

Press Select during demonstration mode to display an aquarium screen. Press A (x2) to return to demonstration mode then display a confetti screen. Press B (x2) to return to the demonstration mode then display a chalkboard.