Mega ? Block

'''Giant ? Blocks (or Giant Question Blocks') are giant versions of ? Blocks first found in Super Mario Bros. 3'' and its remakes. 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 or coins in Giant Land, and three 1-Up Mushrooms or one of the game's three Suits (the Tanooki, Frog, and Hammer Suits) in bonus areas.

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

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

Giant ? Blocks re-appear, albeit rarely, in New Super Mario Bros. Wii. They only appear 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 (as they are too large), and they are merely used as platforms throughout the level.

Giant ? Blocks return in New Super Mario Bros. U as blocks in various Soda Jungle courses.

Giant ? Blocks also appear in Mario Kart Wii, and in Mario Kart 8. They appear in Grumble Volcano in both games.

Giant ? Blocks appear in Paper Mario: Color Splash in Mondo Woods. They are normal ? Blocks that were enchanted by Kamek.