! Blocks (also sometimes referred to as Exclamation Mark Blocks or Exclamation Point Blocks) are special blocks in the Super Mario series, that first appear in Super Mario World. The yellow and green ! Blocks usually contain items while the other colors usually do not. When they are filled, the yellow ! Blocks contain a type of Mushroom, the green contain a Cape Feather; and the red, pink and blue ! Blocks contain objects that vary game to game. After a full ! Block is bumped, it turns into a Used Block, which can't be destroyed.