World 3-5 is the fifth normal level of World 3 in New Super Mario Bros. 2. It is an underwater level filled with massive boulders that attempt to crush Mario or Luigi. This level is also the only level to feature Bloopers, which hide in pipes.
Mario begins in front of the pipe going underwater. A Roulette Block first appears, followed by a Blooper hiding in a pipe. More Bloopers can be found along with many coins. A boulder will then begin rolling down. A Blooper Nanny will then appear along with a P Switch which makes blue coins appear. A larger boulder will then appear. Further down is the checkpoint. A ? Block containing a Fire Flower follows along with more Bloopers and a Red Ring. A Hidden Block to the left of the arrow sign on a yellow pipe contains a 1-Up Mushroom. This is followed by more boulders and the exit pipe. Back on land are several stone platforms leading to the flag pole.
- Star Coin 1: The first Star Coin is enclosed in several blocks which cannot be broken by Mario. Mario will need to move further until another boulder appears, then swim backwards, ensuring that the boulder can catch up, then allow it to break the blocks.
- Star Coin 2: The player needs to look for a yellow pipe on the floor where the boulder used to break the blocks for the first Star Coin was, then warp through it. The second Star Coin can be found below several pipes that are infested with Bloopers. When Mario goes near the Star Coin, it will move to the other side of the room. Mario will need to avoid the Bloopers to obtain the Star Coin. There is a Hidden Block on the left containing a Starman.
- Star Coin 3: Similarly to the first Star Coin, Mario needs to move further down from the Star Coin until a big boulder appears, then move backwards and allow the boulder to break the blocks enclosing the Star Coin.