Poison Bomb

Poison Bomb is an original throwing item introduced in Super Smash Flash 2.

Overview
The Poison Bomb is a spherical blue projectile with a yellow image of a skull and crossbones on the front and four green pressure plates on the sides. When thrown or damaged, it will break upon contact with an opponent or platform, releasing a cloud of green gas that deals poison damage to any players who make contact with it, including the one who threw it.

Trivia

 * Poison Bomb is the second original item to be included in Super Smash Flash 2 and in the overall  series, the first of which is the Firework.