Allergia Gardens is the setting of the final episode of Wario: Master of Disguise. Wario comes here in order to search for the fifth and final Wishstone fragment. It is a vast, labyrinthine hanging garden with many vines, spikes, and mushrooms. Many areas require the player to solve mushroom-based puzzles in order to continue. The purple doors with looping arrows on them will simply take Wario back to the same room; the green mushrooms in the area must all be pressed in order to turn the purple doors green and let Wario continue. Some of the mushrooms are invisible and require Genius Wario to see them and press them down. If a purple mushroom is pressed, either by Wario or by an enemy, the green mushrooms will be pushed back up and the player will have to start over, but once all of the green mushrooms in a given area are pressed, they will remain pressed and cannot be pushed back up. There are also red mushrooms that when pressed, cause vines that normally impede Wario's progress to wither.
This area also features devices with huge gears in them, each with two switches on them. Pressing the switches in a certain order will cause a ladder to appear. The correct order for each switch is indicated by arrows displayed somewhere in the level. However, one of the arrow sets is invisible and requires Genius Wario to see it, and another set of arrows corresponds to a room with two switches, meaning the player must remember not only the directions of the arrows, but the colors as well.
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