4 Wheel Thunder

Full pause screen:
Pause game play, then press X + Y.

Extra tracks in championship mode :
Successfully complete championship mode to unlock the Atlas Sandstorm, Corsica Rain, Far West Night, Iceland Snow, Scandinavia Storm, and Norway Night tracks.

Extra tracks in outdoor arcade mode:
Successfully complete outdoor arcade mode to unlock the Scandinavia, Jordan, Greece Sunset, Norway, Iceland, Atlas, Alps, and Canada Rain tracks.

Extra tracks in indoor arcade mode:
Successfully complete indoor arcade mode to unlock the Indoor Scandinavia, Indoor Far West, Indoor Iceland, Indoor Atlas, and Greece Daylight tracks.

Two player tracks in one player mode:
Successfully complete any of the two player indoor or outdoor track series, then save the game. Enter one player mode to access all of the series that were unlocked in two player mode.

Extra monster trucks:
Successfully complete championship mode to unlock three hidden monster trucks.

Hint: Fast start:
Press R + A (using the default controller setting) when "Go" appears during the countdown at the start of the race. If done correctly, you will get a four second boost and also start the race faster.

Hint: Retry jackpot bonus:
Complete a race in championship mode, then save your game. If you are awarded the jackpot bonus, but lose, simply reload your saved game to try again.
Information in this section was contributed by shamisfargo67.

Hint: Toy cars:
When you get a jackpot and do not win anything, a box pops up that reads "You win a toy car!". In two player bonus games mode, you can get these toy cars and drive them for the games.
Information in this section was contributed by redcomet.