Challenge Mode
On the "Enter Cheats" screen press X, A, B, UP. If you do it right, "Challenge Mode" will appear at the top of the screen.

Developer’s Team
As a user profile, type in the name CREDITS.You should get the five developers teams with excellent stats.

Childs Play
On the "Enter Cheats" screen, press X, A, B, LEFT. If you do it right, "CHILDS PLAY" will appear at the top of the screen.