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An Obake Block (おばけブロック, Obake Burokku) is a very rare, possessed ? Block that appears in New Super Mario Bros. Wii. Only four of them appear in the secret area in World 7-. They guard a Star Coin. They resemble a normal ? Block, but as the player approaches, they turn purple as they float over the character and throw themselves at the player (a very similar mechanism is used by an Obake Stand), breaking apart and releasing a coin if they hit the floor or a platform. They can be distinguished from real ? Blocks by looking at the question mark; unlike the real ? Blocks, the question mark does not move, similar to the ? Blocks in Super Mario Bros.
Conceptually, Obake Blocks are much like Fake Blocks, while their method of attack is also very similar to that of the Invisighoul of Yoshi's Island DS throwing furniture - remaining still until approached, then swaying in the air and thrown directly at the player. A laughing Boo also implies it was thrown by one, as the furniture was by Invisighouls.