Ghost Block

An  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. They guard a Star Coin. They resemble a normal ? Block, but as Mario approaches, they turn purple as they float over the character and throw themselves at him (a very similar mechanism is used by an Obake Stand), breaking apart and releasing a coin if they hit the floor or a platform.

Obake Blocks also appear in New Super Mario Bros. U and New Super Luigi U in multiple haunted levels.