Level select
Pause the game, then hold L + R and press Y, B, Y, B(2), X to unlock all levels.

All moves
Pause the game, then hold L + R and press Y, B, Y, X(2), B to unlock all moves.

All mini-games
Pause the game, then hold L + R and press Y, B, Y(2), X(2) to unlock all mini-games.

More HP from food
Pause the game, then hold L + R and press Y, B, Y, B, X, Y.

Extra damage
Pause the game, then hold L + R and press Y, B, Y, B, Y, X.

Always power golf
Pause the game, then hold L + R and press Y, B, Y, B, X, B.

Bonus comic 1
Pause the game, then hold L + R and press Y, B, X(2), B, Y to unlock bonus comic 1.

Bonus comic 2
Pause the game, then hold L + R and press Y(2), X, B, X, B to unlock bonus comic 2.