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Mario puts the key in the Keyhole.
The Keyholes are secret levelpassages in the game Super Mario World. Every red level in the game has secret passages, most of them the secret exits are the keyholes. To go to secret levels, Mario or Luigi must put a Key in the keyhole. If Mario or Luigi has a owned Yoshi rode by one of the Mario Brothers, Mario and Luigi would lose the owned Yoshi if they put the Key in the keyhole. But, if you had the key in Yoshi's mouth at the time, you could still use the Keyhole.