Expert mode
Press Start to pause game play, then press Select. The preview
window will not show the next piece when game play resumes.
Reverse movement
Hold Left or Right while any piece except a straight bar or block
is descending until it is against the wall. Then, keep holding
Left or Right and rapidly tap A.
Alternate screens
Allow the game to remain at the main screen until demonstration
mode begins. Press Select to display a screen featuring swimming
fish. Press A to return to the next part of demonstration mode,
then press A again to display a screen with confetti and the
Nintendo logo. Press B to return to the next part of
demonstration mode, then press B. Eventually a screen featuring a
blackboard will appear.
In-game reset
Press Start + Select + A + B during game play.
Continue game play
Press Start to pause game play in single player mode, then turn
off the Game Boy. A continue screen will appear when the Game Boy
is turned on again.