Free Frisbees
To gain three Frisbees, pause the game and press C, A, B, A, Left, Left.
Secret Room
There is a secret room in the first Aztec temple. Before the first pedalcopter level, while jumping over the springs that nail you to spikes on the ceiling, ride the last spring and pull right. You will travel through the spikes and find three treasure chests worth a lot of points! To leave this room, walk left.
Slow Motion
Pause the game, then press Down, A, C, Up, Left, Left. To return to normal speed, pause again and press Left, Right, Up, Down, A, C.