Cascade Chasm, or World 2-4, is the third course of Soggy Sewers. It's also the first level to autoscroll. It's located in a chasm, as the name implies, with many Buzzy Beetles.
- Star Coin #1: Follow the trail of coins to the right of the first red pipe in order to get to the first Star Coin.
- Star Coin #2: Right before the checkpoint, bounce off the first White-Green Checkered Blocks to nab the Star Coin.
- Star Coin #3: Follow the coins that point downwards, then use the White-Green Checkered Blocks to get the Star Coin.
- Buzzy Beetle
- Piranha Plant
- Fire Piranha Plant