Boost Block

A Boost Block is a block used in New Super Mario Bros. U. Boost Blocks can be used only in multiplayer mode, and to use one, a player must tap the Wii U GamePad screen. Boost Blocks are intended to serve as platforms to help Mario and co. reach the end of the level easily. There are other uses for Boost Blocks, such as placing them above character's heads to prevent falling objects like Thwomps to harm them. If a player steps on a Boost Block, the block releases three coins while filling the boost meter. If a player steps on 10 Boost Blocks while a symbol is shown in a row, a Boost Star will appear so the GamePad player can tap it to gain Boost Star power.

If a player gets 99 lives, the boost blocks are shrunk to mini versions, making them more difficult to land on.