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Boost Rush is a mode featured in New Super Mario Bros. U, similar to Coin Rush from New Super Mario Bros. 2. In Boost Rush, the player will play through a series of levels grouped together in packs, and the objective is to play through autoscrolling levels and collect the most coins, lose the least amount of lives, and make or beat the best time. The speed of the scrolling will increase every ten Coins while Star Coins worth 20 coins each. Unlike Coin Rush, though, the player has limited lives and can gain more by collecting coins or extra lives, although all players share the same lives, and the player using Boost Mode can pop any players in bubbles. When a player is playing Boost Rush, Miis can be seen in the background, supporting the players.
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