Ridge Racer cheats and cheat codes for Nintendo DS

Unlockable extra cars:
First you have to unlock the 00-Agent car. To unlock Agent car you have 
to play 10 multiplayer races, by using only a single cartridge.

If you keep playing in multiplayer, you will unlock more bonus cars:
Example: Pook, Red Shirt Rage, Caddy Car, Galaga88, ShyGuy, and 
Mario Racing.

Unlock all extra cars:
Reach a 1st place in every Platinum Grad Prix races. 

Unlock cars in Car Attack mode:
Reach a 1st place on the indicated Gran Prix to get opponents car.

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

Preview car:
Go to the car selection option. Hold Y and press R or L to rotate the choosen 
car. Stop the rotation by pressing Select button. To move a camera Hold X and 
press R or L. Hold Y + X and press R or L to zoom out or in.