Newer Super Mario Bros. Wiki
Switching Sewer
Game Newer Super Mario Bros. DS
Level number 2-3
Time 500
World Crystal Sewers
Level type Underground, Sewer
Enemies Big Piranha Plants
Koopa Troopas (G & R)
Piranha Plants
Game Progression
Previous level (2-2) Pipebreak Cave
Next level (2-4) Wagon Way
(2-A) Hydroskip Drain (secret)

Switching Sewer (or World 2-3) is the third level of Crystal Sewers in Newer Super Mario Bros. DS. It takes place in an underground sewer full of Piranha Plants and manholes.

Switching Sewer is unlocked by completing Pipebreak Cave. Completing its normal exit will unlock Wagon Way, and completing its secret exit will unlock Hydroskip Drain.

Star Coins

  • Star Coin 1: At the start, when you hit the ! Switch, quickly get up the Red Blocks. At the top of these Red Blocks will be the Star Coin, too high to reach without the blocks.
  • Star Coin 2: Right after the first Star Coin, this'll be in plain sight, blocked off by some Stone Blocks. Get past the Big Piranha Plant, then activate the ? Switch up above. Then, instead of entering the Warp Pipe, jump up to make the Flipper close, and grab the second Star Coin.
  • Star Coin 3: You need to be Super Mario or up to get this Star Coin. After the checkpoint, there'll be a ! Switch. Hit it, then break the Brick Blocks near it. You'll then have to wall jump up to get the Star Coin.

Secret Exit

This level features a secret exit, which'll lead you to Hydroskip Drain. After the checkpoint, there'll be a ! Switch. Once you activate it, run right as fast as you can. Avoid the Flippers below, then enter the Warp Pipe which is only accessible with the Red Blocks. This'll lead you straight to the secret exit.


Walkthrough (6:07 to 9:29)
Secret Exit (N/A to N/A)


Name Music Origin Area played
Underground Remixed underground theme from New Super Mario Bros.. Entire level