Pause the game and press Select. This will make the preview window disappear when
you resume play.
Turn the game on and let demo mode start. Press Select to bring up a swimming
fish screen. Press A to return to demo mode, then press A again to bring up
confetti and the Nintendo logo. Press B to return to demo mode, then press B
again. You'll eventually see a chalkboard screen saver.
Fireworks Screen Saver:
Beat a high score.
Move blocks up:
While any piece except a straight bar or block is descending, hold Left or Right
until it's against the wall. Now while still holding Left or Right, rapidly
press A and the piece will start moving back up.
Special thanks to Revolution reader Bryan Lawrence!