Mega ? Block

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Giant Question Blocks (or Giant ? Blocks) are blocks in Super Mario Bros. 3. They are found mainly in the game's World 4 (Giant Land), but can also be found in certain secret areas throughout the game. They contain regular power-ups in Giant Land, and usually multiple 1-Up Mushrooms or various Suits - such as the Tanooki, Frog, and Hammer Suits - in bonus areas.

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Mario approaching a Giant Qusetion Block in Super Mario Bros. 3.

Giant Question Blocks are also found in Mega Mushroom Toad Houses in New Super Mario Bros., where they would give Mario or Luigi a Mega Mushroom.

In Mario & Luigi: Bowser's Inside Story, Broque Monsieur has a Giant Question Block in his collection, but it's unobtainable throughout the game.

Giant Question Blocks re-appear, albeit rarely, in New Super Mario Bros. Wii. They appeared in World 6-5 floating on water.

In Super Mario Galaxy 2, they appear in the Supermassive Galaxy. Mario and Luigi are unable to hit these blocks, and they are merely used as platforms throughout the level.

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Mario approaching a giant question block in Super Mario Galaxy 2.