GameCube System cheats and cheat codes for Gamecube

New starting sounds #1
Hold Z when the Gamecube logo appears

New starting sounds #2
Hold Z then about one second later hold A.

Switch between refresh rates:
When you turn ON your gamecube system, hold B until the
message "Would you like to switch to 50hz mode?" (for PAL games)
or "Would you like to switch to 60hz mode?" (for NTSC games)
appears.

Control starting logo
While the cube bounces down, hold A to form the "G" logo to spin
it.

Set system time and options
When you turn ON your gamecube system, hold A or hold A while
the cube rolls around the screen.