World Mushroom-3 is the third normal level of World Mushroom in New Super Mario Bros. 2. It is an underground-themed level cramped with sandy-looking objects, Buzzy Beetles, and red POW Blocks.
Mario begins on a set of Brick Blocks underground where a Buzzy Beetle appears. There are red POW Blocks which break Brick Blocks and reveal anything hidden behind them. After moving a certain distance, the level begins to autoscroll. Buzzy Beetles can be found on some ? Blocks. One of them contains a Fire Flower. Orange platforms that continuously move up can then be found. Donut Blocks and rectangular Donut Blocks make an appearance here. Another Fire Flower can be found just before an ! Pipe which produces three 1-Up Mushrooms. Following that are more orange platforms which, this time, continuously move down. A ? Switch can be found in between two yellow pipes. It causes coins to spawn from out from the pipes. A Buzzy Beetle can then be found on a Donut Block which helps Mario to get coins from a nearby Brick Blocks. This is followed by a yellow pipe leading to the checkpoint area, where the level stops scrolling. The checkpoint is located on several Brick Blocks with a POW Block under it. Activating it causes four Fire Flowers to be released. Another yellow pipe leads to the next area, where the level autoscrolls again. More orange platforms can be found moving downwards. A brick wall will then block Mario's path, which can be easily broken down with a nearby POW Block. Two Buzzy Beetles appear, followed by another set of Brick Blocks (containing the third Star Coin). More moving platforms come after. A wall will then block Mario's path, which will open after a set period of time. Another ! Pipe will then appear. Exhausting it will then release a Mega Mushroom. The yellow exit pipe will then be seen. If Mario ate the Mega Mushroom earlier, he can then destroy several blocks leading to an area full of pipes, Piranha Plants and coins. That leads to another exit pipe (leading to the same Goal Pole). Back in the desert, there are several hills which Mario can do a triple jump on to reach the top of the Goal Pole a short distance away.
- Star Coin 1: The first Star Coin is in plain view. However, it can be tricky because it is sitting on a single Donut Block under the black pipe. Mario must be cautious when trying to get the Star Coin.
- Star Coin 2: After the checkpoint, the second Star Coin can be seen. Mario will need to use the platforms that move downwards in order to reach the second Star Coin on a Donut Block.
- Star Coin 3: The third Star Coin is enclosed in several Brick Blocks. Mario will need to use one of the nearby Buzzy Beetles in order to hit a POW Block, which opens up a path through the Brick Blocks. Activating another POW Block will release the Star Coin.