The Great Deflate
From the Super Mario Wiki
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At a beach, an inflatable Thwomp falls onto the ground, and the camera zooms out revealing a second inflatable Thwomp as the teams land on each respective one.
Players must Ground Pound an inflatable, blue Thwomp made of rubber enough to completely deflate it. The higher the jump before the Pound, the more air gets deflated. The first team to completely deflate their Thwomp wins.
The team that deflated their Thwomp will do their victory poses, while the losing team sulks.
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