Reverse Tracks in Multi-Player Mode
On the Circuit Selection screen, choose the circuit you wish to race on and press Select. As the cars start to drive into the tunnel, quickly press and hold X and Square. While holding them down, press either Left or Right. If the cheat is successfully activated, the cars will spin around and drive into the tunnel backwards.
When you're about to select a track, press L1 + R1 + X + Down. A sweeping arrow should be drawn at the bottom of the information panel.
All Tracks in One-Player Mode
Get all of the tracks in the one player mode by pausing the game and while paused, choose OPTIONS-SOUND then go to FX and press L1+L2.
Jumping Bean Cars in Multi-Player Mode
After you choose your vehicle and your track, as soon as the circuit loads and the "3, 2, 1 GO" countdown has started, simultaneously press Circle and Left.
At the track select screen push L1+L2+R1+R2 to play at night.