Pipeline Tower, or World 2-Tower, is the fourth and final course of Soggy Sewers. It's theme is a tower full of pipes.
- Star Coin #1: At the beginning of the level, through an alcove to the right.
- Star Coin #2: Take the very right pipe at the fork after the checkpoint, then wall jump to get the Star Coin.
- Star Coin #3: Just before the boss door, the player must jump off from the left side of the leftmost pipe, then spin in midair to get the Star Coin and have a nice landing.
- Dry Bones
- Fire Piranha Plant
- Spiked Ball
- Piranha Plant
- Boss: King Thwomp