Blooper's Secret Lair is the hidden level of Acorn Plains and the first hidden level of New Super Mario Bros. U. The level is an underwater course. The level is accessible midway through Tilted Tunnel.


The level is entirely under water until the very end of the level. Bloopers are the only enemies and generally exit pipes at an angle. Passing this level leads to Soda Jungle.


This level begins on a platform made of Warp Pipes, with one that leads the player into the underwater section. The underwater section has many Warp Pipes, many of which either pump a current that forces the player in a certain direction or expel Bloopers. The section begins with two Warp Pipes pumping currents on the left side. A ? Block containing a power-up is found, followed by two diagonal Warp Pipes containing Bloopers. Yellow Warp Pipes that alternate blowing currents are found, along with three more Bloopers. A ? Block containing a power-up is followed by another Blooper, as well a section with multiple Warp Pipes that pump currents and rotate ninety degrees. The player continues through a section with more Bloopers and rotating Warp Pipes, including a group of four Warp Pipes that move in a circle. A Red Ring is found, along with more currents and a Blooper in a section leading to a Warp Pipe that leads to the next area. Two Bloopers are found at the beginning of the area, which is vertical and contains Warp Pipes blowing currents that rotate in circles. On the right side next to the red Warp Pipe is a Hidden Block containing a 1-Up Mushroom. A Warp Pipe at the end of the section leads to the area with the Goal Pole.

Star Coins

  • Star Coin 1: Swim in between the two green pipes hanging from above and avoid the pressure that make you move away from the gap.
  • Star Coin 2: Near the red pipe lies a Star Coin that looks impossible to grab. Cross by going under the red pipe but don't go too low to avoid dying.
  • Star Coin 3: After finding the checkpoint, find the bubble coins leading to the pipe that isn't sticking out much on the left and go in it to reveal an area with the coin.