Bonus levels refer to the fifth level of an Adventure Mode area (x-5). Most of the Adventure Mode variety are sneak peeks of a mini-game or of Puzzle Mode, except for Level 5-5 (level 5-5 was supposed to be a mini-game, except it was canceled). However, when replaying Adventure Mode, the levels are replaced by their mini-game/puzzle counterparts. The level before each of these, the player will receive an item instead of a plant. For example, after level 1-4 the player gets the shovel.