List of New Super Mario Bros. U and New Super Luigi U glitches

These are the glitches found in New Super Mario Bros. U.

This glitch can be done in Iggy's Volcanic Castle, when the player fights Iggy Koopa, when he is on the top roof, once he falls off it, Mario must immediately jump on him, and he will then go into his shell, but another one appears and will be faced sideways. The glitch turns off in a few seconds.

Just like many games in the Super Mario series, Mario can earn extra lives in New Super Mario Bros. U by repeatedly jumping on a Koopa Troopa shell kicking it against a wall. This can also be done with Gargantua Koopa Troopas and Buzzy Beetles.

This is recommended to do in Walking Piranha Plants! if Nabbit is there. The player must start with a Star and chase him to one of the first pits. The player has to grab him then fall. On the screen, it will say "Nabbit got away..." even though he didn't. When the player comes back to Rock-Candy Mines, Nabbit is still ready.

The player should wait until the very end of the Time Limit on a Warp Pipe. If Mario enters the pipe exactly when the time changes from 001 to 000, he goes to the other side of it, and the timer will remain stopped at 000 until the plumber touches the Goal Pole or exit the level. This goes the same for time Challenges on Challenge Mode. If one enters a Door at the time where it turns from 001 to 000, they won't die as well.