Midway Arcade Treasures cheats and cheat codes for Gamecube

Additional health in Gauntlet
To get bonus  health, push the X button on your controller.

Gauntlet: Jump to level 4
Enter to the exit in the bottom right corner on level 1 to jump to level 4. 

Gauntlet: Jump to level 8
Enter to the exit in the top right corner on level 1 to jump to level 8.

Gauntlet: Jump to level 8
Enter to the secret exit to the right of the main exit on level 4 
to jump to level 8.

Roadblasters:  Jump to stage 50
Turn ON the "Indestructible Demo Mode" option, then finish the first 10 stages.
When you begint the 11th stage you will jump to stage 50.

Rampage: Select characters
Begin the Rampage game by using controller-1 in single player mode. When you are 
at the start screen, hit the Start button on the indicated controllers to 
select characters:

Play as George the Gorilla: Press start on controller-1
Play as Lizzie the Lizard: Press start on controller-2
Play as Ralph the Wolf: Press start on controller-3

If you only have one controller, just plug it into another port.