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Oshi Chau? (おしちゃう？, meaning: "Will you press?") is one of the six microgames made by Sekai no Nabeatsu with WarioWare: D.I.Y. for download in the category Big Name Games. It was available in Japan from April 29 to July 10, 2009.
A very simple math problem appears on the screen in three parts in succession, namely "3", "+ 6", and "= ?", forming "3 + 6 = ?". Three numbers are given as possible answers in the lower part of the screen, specifically "2", "9", and "11." While the second number is actually the correct sum, the game's instructions at the beginning assign the player to do nothing. Upon tapping any of the numbers, the player loses, as they ignored the instructions; as such, the game can only be won by not doing anything. Nevertheless, the math problem is intended to trick the player into tapping a number due to its simplicity.