Cars
Beat ten races in multi-player to unlock these cars

    * 00-Agent Car
    * Caddy Car
    * Galaga '88
    * Mario Racing
    * Pooka
    * Red Shirt Rage
    * Shy Guy 

Grand Prix Cars
After you beat a stage in Grand Prix, you can unlock the following cars:

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

Unlock Songs

    * Galaga Pac Jam: Unlock the Pooka car. You have to race more than ten multi-player races.
    * Mushroom Kingdom II: Unlock DK Team Racing. You have to beat DK Team Racing in Car Attack Mode after winning Grand Prix 6.