Flat Wario is one of Wario's many transformations in the Wario Land game series. If crushed by a falling weight in Wario Land II, Wario Land 3, or Wario Land 4, Wario is squashed flat, shortening his jump and drastically affecting his speed. However, he can glide smoothly in the air to reach places previously unattainable, and slip through tiny cracks in walls. Certain machines and enemies will return Wario to his original shape, as well as getting wet. In Wario Land 4, Wario can be crushed by a piston in order to transform, and a Decompressor will transform him back into his normal self. Flat Wario can also fall in water to transform him back into his normal self.
Flat Wario gets referenced in WarioWare: Touched! at the end of the game. At the end of Wario-Man's cutscene, the guru that Wario stole the DS from is mad from before, so he whacks him on the head with his cane. As a result, he turns into Flat Wario.
A possible reference to this form of Wario can be found in Mario Golf: Toadstool Tour. If he gets a Double Bogey or worse, Wario holds a huge boulder over his head and tosses it into the air in rage. The boulder eventually comes down again and hits him in the head, flattening him in the process. He then proceeds to walk off to the right of the screen in a similar manner to Flat Wario.
Wario Land II
Wario Land 4
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