Ridge Racer DS cheats

Reverse track:To play on a reverse track, drive forward at the starting point until you get to fifth gear. Then, make a "U" turn and drive towards the wall. If done correctly, you will hit sixth gear and the wall will disappear. The track will now be in reverse.

Bonus cars:
Play ten multi-player races using a single cartridge to unlock the 00-Agent car. Keep playing in multi-player mode to continue unlocking bonus cars, in the following order: Red Shirt Rage, Pooka, Caddy Car, Galaga '88, Shy Guy, and Mario Racing.

To unlock all bonus cars in the game, win all the Platinum GP races.

To unlock a car in Car Attack mode, win the indicated Grand Prix to get that car as an opponent in Car Attack mode. After defeating that car in Car Attack mode, you can then drive it in Car Attack mode.

13th Racing Kid: Grand Prix 4
Age Solo S: Grand Prix 5
Assoluto Infinito: Grand Prix 5
Atomic Purple: Grand Prix 6
Burning Nightmare: Grand Prix 7
Dig Racing Team: Grand Prix 3
DK Team Racing: Grand Prix 6
Galaga RT Blue: Grand Prix 3
Galaga RT Red: Grand Prix 2
Galaxian Paradise: Grand Prix 4
Micro Mouse Mappy: Grand Prix 4
Racing Team Luigi: Grand Prix 8
Racing Team Peach: Grand Prix 5
RT Blue Mappy: Grand Prix 1
RT Bosconian: Grand Prix 2
RT Nebulasray: Grand Prix 2
RT Pink Mappy: Grand Prix 1
RT Xevious Green: Grand Prix 3
RT Xevious Red: Grand Prix 1
Terrazi Terrific: Grand Prix 6