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 * Wario Land II (pictured) was the first game to portray Wario wearing a short-sleeved shirt.
 * Prince Haru is the only character in the Mario series other than Mario with whom Peach has a romantic relationship.
 * Wet-Dry World was used in a Got Milk? commercial in the late 1990s. Mario, who is unable to jump onto a platform in the first area, breaks through the screen, through a series of events winds up in a refrigerator, drinks some milk, becomes super-sized, and starts walking on the top of the level. However, the level shown in the commercial differs from the one in-game in that the sky is bright blue instead of dark.
 * In Super Mario World, the symbol on the mail box of Yoshi's House is Number-kun (〒), the logo of Japan's postal service.