Hydro Thunder cheats and cheat codes for XBox

Unlock Bonus track:
Highlight "Back" at the options menu and press
Up, Up, Down, Up, Down, Down, Start.

Unlock fishing boat:
Unlock all the tracks and highlight Thresher at the Boat Selection
screen. Hold L + R and press View twice.

Faster start
Before the race begins, hold L during the countdown.
when the countdown reaches 3: Release L and hold R
when the countdown reaches 2: Release R and hold L
when the countdown reaches 1: Release L and hold R
Note: This trick works if you have a default controller setting.