Slot Blocks[1] are a type of block appearing as the main function of Lucky Houses in Super Mario 3D World. Functioning as a slot machine, Lucky Houses contain four Slot Blocks with constantly scrolling images of five power-ups (Double Cherry, Fire Flower, Boomerang Flower, Super Leaf, and Super Bell), which the player must stop by hitting them. The player will then receive a certain amount of coins depending on how many images are matched.