- Not to be confused with Dark Matter.
- Not to be confused with Toxic Gas.
Poison Water (sometimes Poisoned Water, Toxic Water or Poison Swamp) is a poisonous liquid found in some games. It's commonly purple or dark green, and in most appearances can kill Mario instantly.
Super Mario series
In Super Mario Sunshine, Poisoned Water appears in a secret area found within Delfino Plaza. In this area, Mario must ride on a leaf down the Toxic Water in order to collect eight Red Coins. Also worth noting is that in certain episodes of Bianco Hills, Ricco Harbor, and Noki Bay, the water is polluted and can still hurt Mario, but cannot instantly defeat him.
In New Super Mario Bros. and New Super Mario Bros. Wii, Poisoned Water can be found throughout several stages, mostly in the forest worlds World 4 from the DS game and World 5 from the Wii game. In these games, it's purple and can kill Mario instantly. Dorrie and Giant Wigglers are the only characters that are resistant to poison water.
In Super Mario Galaxy, an enormous planet made of poison liquid is found in the Bubble Breeze Galaxy. It is also found in the Luigi planet from Toy Time Galaxy. An element similar to poison called Dark Matter appears in Bowser's Dark Matter Plant. In the sequel, the toxic water is found in Boo Moon Galaxy (in the Swamp Planet) and in Mario Squared Galaxy as well.
In Super Mario 3D Land, World 2-2 and Special 6-3, both underground levels, contain Poisoned Water, which is purple once again.
The poisonous water reappears in New Super Mario Bros. 2, again in forest-themed levels. As a new trait, they can rise and drop in World 3-4. Porcupuffers are resistant to Toxic Water.
It returns in the game New Super Mario Bros. U, where pools of poisoned water surround Soda Jungle, having the same look.
Donkey Kong series
Donkey Kong Country
In Donkey Kong Country, the level Poison Pond takes place in a greenish toxic pond. However, it's harmless to Donkey Kong and Diddy Kong, just like water.
Donkey Kong Country 2: Diddy's Kong Quest
In Donkey Kong Country 2: Diddy's Kong Quest, a poisonous liquid appears quickly rising in Toxic Tower. If Rattly, Squawks or Squitter stay in the toxic water for some seconds, they will lose health.
Donkey Kong Country 3: Dixie Kong's Double Trouble
In Donkey Kong Country 3: Dixie Kong's Double Trouble, Poisonous Water appears in Poisonous Pipeline. This time, the poison inverts the controls to move Dixie Kong and Kiddy Kong. Jumping out of the poison, the apes instantly go back to normal controls.
- In New Super Mario Bros. Poison Water appears to be a recolor of standard water making it seem less hazardous. In New Super Mario Bros. Wii and onwards however, it now more resembles lava making it's deadly status more obvious.