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Dreamcast - 4 Wheel Thunder cheats

Full pause screen                                                 
Press X + Y, while paused the gameplay.

Quick start boost:
During the race pre-countdown, press R + A when the "Go" message 
appears.

Bonus championship mode tracks and bonus monster truck #1:
Finish the championship mode once.

Bonus outdoor arcade mode tracks and bonus monster truck #2:
Finish the outdoor arcade mode once.

Bonus indoor arcade mode tracks and bonus monster truck #3:
Finish the indoor arcade mode once.

Jackpot bonus
Finish a race in championship mode, after save. If you do not win 
the jackpot, reload your saved game to try again.