Jeremy McGrath Supercross World Cheat Codes for Gamecube

Infinite turbo
At the main menu, press Down, Down, Down, L, R, Z. Entered correctly, a quick flash indicator in the bottom appears.
Submitted by: Hardy

Bouncy bike
At the main menu, press Up, Up, Y, Y, X, X. Entered correctly, a quick flash indicator in the bottom appears.

Big heads
At the main menu, press B, X, R, L, Right. Entered correctly, a quick flash indicator in the bottom appears.
Submitted by: Hardy

Tiny mode
At the main menu, press L, Z, Left, Right, B, B. Entered correctly, a quick flash indicator in the bottom appears.

Tag mode
At the main menu, press Z, X, Z, X. Entered correctly, a quick flash indicator in the bottom appears.

Low gravity
At the main menu, press Left, Right, Up, Down, B, B, B. Entered correctly, a quick flash indicator in the bottom appears.

No boundaries
Press L, R, Z, L, R, Z at the main menu. The lower left corner of the screen will flash and a message will appear to confirm correct code entry. Repeat the code to disable its effect.
Submitted by: Hardy