Mr. Do! Cheats
Downloads
Discussion 
SNES Cheats
Level select
Press Down(8) when the Universal logo is displayed during the introduction sequence. A level select option will appear on the main menu.
Ninety nine lives
Press Left(8) when the Universal logo is displayed during the introduction sequence.
Alternate title screen
Press Up(8) when the Universal logo is displayed during the introduction sequence. "Mr. Du!" will appear on the title screen.