Double money
Save your game twice and then transfer the money.
Submitted by Steadman
Bonus Animals
Buy all kangaroos and dinosaurs.The black Kangaroo and white dinosaur will be available.
Submitted by Steadman
Extra Animal Footstep Sounds
Pause the game and Press L1, L1, R1, R1, Down, Up Circle
Mirror Track
Finish all tracks in first place. then press right at the track selection screen.
Submitted by Steadman
Ending Sequence
Complete all mirror tracks. Now press Select at the title screen.