A Roulette Block is a special type of block in the Mario series, which first appears in Super Mario World. It contains several items that alternate like a roulette, hence the name. The player obtains the item represented on the block when they had hit it.
Super Mario World U
Roulette Blocks appear in Super Mario World U, functioning the same way they have in the past.
Roulette Blocks appear in Super Mario Moose. Hitting it will grant the player a random power-up (depending on the level); the Super Mushroom, the Fire Flower, the Super Leaf, the Boomerang Flower, the Double Cherry, the Moose Mushroom, the Crow Suit, the Spike Flower, the Super Star, or the 1-Up Mushroom.
Roulette Blocks appear again in Super Mario Moose Deluxe. They work the same as in the previous game.