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Toxic Cloud is a rare stage hazard appearing in Super Mario 64, Super Mario 64 DS, and Super Smash Bros. Brawl. When the character walks into an area of Toxic Cloud, they will start to take damage at steady intervals.

In Super Mario 64 and Super Mario 64 DS, Toxic Cloud appeared only in the Toxic Maze in Hazy Maze Cave. The cloud covered most of the ground in the Toxic Maze. When Mario, Luigi, Wario, or Yoshi entered an area of the cloud, they would lose one wedge of health on their health meter after several seconds. If one of the characters stays in too long, they will lose all of their health and lose a life. Metal Mario/Metal Wario and Vanish Luigi are not affected by toxic cloud, however. In the Nintendo 64 version, the gas was yellow. In the remake, it was violet instead and would actually knock the character back a bit, and it also appears in the Goomboss Battle stage.

In Super Smash Bros. Brawl, a toxic cloud appears in the Subspace Emissary. It appears in some of the cave areas and the Great Maze. When the character enters this toxic cloud, they will incur damage at a much faster rate than in Super Mario 64/Super Mario 64 DS, at about 2% of damage per second. This toxic cloud could not KO the player, since it does not do any knockback, but it does make the character more vulnerable to enemy attacks. The character could temporarily clear the toxic cloud by hitting a red switch often situated near the cloud.

Trivia

 * In Super Mario 64, if Mario stays in Toxic Cloud for a period of time without moving, he will start to cough, even as Metal Mario.
 * In Super Mario 64 DS, the same alarm sound that plays when a character's low on health underwater or in freezing water will also play when in the toxic cloud.