All Characters-Pause the game, hold L and press X, B, LEFT, Y, RIGHT, RIGHT.
50 Balls-Pause the game, hold L and press UP, X, B, Y, LEFT, LEFT.
Items Don't Hit-Pause the game, hold L and press X, B, B, LEFT, LEFT, Y, B.
Fruit-Pause the game, hold R and press B, X, LEFT, LEFT, Y.
Fly as any character-Pause the game, hold L and press X, Y, A, LEFT, LEFT, RIGHT, RIGHT.

Happy gaming =p

On the world Dino Oasis when most of the computers are going up ropes there should be a mushroom next to it jump on the mushroom and you should be ahead of all the computers (this is not on all ladders)