Here are some cheats and tips for the game Speed Devils.
All cars and tracks:
Press B, Right, B, Right, Up, B, Up during game play.
Unlimited nitros:
Press Down, Up, Down, Up, A, X, A during game play.
Skip current class:
Press Down, Right, Down, Right, A, X, A during game play to advance to
the next class in championship mode.
More money:
Press A, Right, A, Right, Up, B, A during game play for an additional
$100,000 in championship mode.
Unlimited money:
Press B, A, B(2), A, Down, Right, Left during game play.
Full pause screen:
Press Start to pause game play, then hold X + Y.