Infinite turbo
At the main menu, press Down(3), L, R, Z. If you entered the code correctly, the lower left corner of the screen will flash and the message "Need for speed" will appear. Repeat the code to disable its effect. -From: hrbigr@bbtel.com

Bouncy bike
At the main menu, press Up(2), Y(2), X(2). If you entered the code correctly, the lower left corner of the screen will flash and the message "Bouncy, bouncy" will appear. Repeat the code to disable its effect. -From: Baseballplyr3016@aol.com

Big heads
At the main menu, press B, X, R, L, Right. If you entered the code correctly, the lower left corner of the screen will flash and the message "Your head expands" will appear. Repeat the code to disable its effect. -From: Baseballplyr3016@aol.com

Tiny mode
At the main menu, press L, Z, Left, Right, B(2). If you entered the code correctly, the lower left corner of the screen will flash and the message "Drink me" will appear. Repeat the code to disable its effect. -From: Baseballplyr3016@aol.com

Tag mode
At the main menu, press Z, X, Z, X. If you entered the code correctly, the lower left corner of the screen will flash and the message "Tag you're it" will appear. Repeat the code to disable its effect. -From: Baseballplyr3016@aol.com

Low gravity
At the main menu, press Left, Right, Up, Down, B(3). If you entered the code correctly, the lower left corner of the screen will flash and the message "Feel lighter" will appear. Repeat the code to disable its effect. -From: hrbigr@bbtel.com

No boundaries
At the main menu, press L, R, Z, L, R, Z. If you entered the code correctly, the lower left corner of the screen will flash and a message will appear. Repeat the code to disable its effect.

All bikes
Successfully complete the hardcore part of career mode to unlock all bikes.