Wait for a wave of poisonous water to pass, then drop down and fly through. (mariopartylegacy.com)
You'll travel to a graveyard, a planet filled with poisonous water with inner tubes that'll you have to cross, and plenty of other neat locations for you to explore! (seafoamgaming.com)
The end of the level has a chase scene where a pink catterkiller chases Sonic, with poisonous water thrown in to the mix to add extra to the challenge. (3dsblessed.com)