Tetris Attack

Expert mode:
Select single player mode and choose the "Vs. Com" option. Hold Up + Select and press A at the difficulty selection screen.

Fight against Bowser in challenge mode:
Enter 78RN5B?8 as a password.
Information in this section was contributed by ThunderBlaze.

Final super-challenge mode opponent with all characters:
Enter SY?L5B7! as a password.
Information in this section was contributed by Boomerwana.

Bonus borders:
Note: This code requires game play on the SNES using a Super Game Boy cartridge.

Yoshi border
Hold Down and press A at the title screen.

Volcano border
Hold Left and press A at the title screen.

Forest border
Hold Up and press A at the title screen.

M.C. Escher-style border
Hold Down and press Start at the title screen.

Cloud border
Hold Left and press Start at the title screen.

Green moon border
Hold Up and press Start at the title screen.

Information in this section was contributed by tony.liquid.