Pause the game while playing and hold Select until a blinking line appears. Then hold A + B and press Left or Right to select an item. Press Up or Down to change the numner of items.
If you dont wake Wario at the beginning, he will be taken by pirates to a bonus level. When you finish the game you will get a different ending.
Press Select + Start + A + B while playing.
Easy to move on conveyor belts:
If you carry an opponent while walking over the conveyor belts, you will not be pushed by it.
Beat the game with 100% and all treasure and map pieces to get a bonus game after the final level.