RC Stunt Copter

All gold medals:
Press Down, Up, Left, Right, Triangle, X, Square, Circle at the title screen.

Level select:
Press Down, Up, Right, Left, Triangle, X, Square, Circle at the title screen.

Extra points:
Press L2, R2, L1, R1, Triangle, Circle, X, Square at the title screen.

View ending sequence:
Press Up, Down, Left, Left, X, Square, Triangle, Circle at the title screen.

For all codes, the phrase "Cheater's Never Prosper" will be spoken and text will appear to confirm correct code entry. (Information from Cheat Machine)