Super Star

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A Super Star, also referred to as Starman or Invincibility Star, is a powerful recurring power-up in the Mario series. In most games, snatching one grants Mario (or any of his friends like Luigi, Toad, Peach, or even Koopa Troopas) temporary invincibility taking down any enemies that come in contact. However, they do not protect from falling down to lava, a bottomless pit or getting crushed.

In Super Smash Flash 2
The Super Star is an item in Super Smash Flash 2. When one appears, it will start bouncing in one direction unless they hit a wall and start bouncing in the other direction (meaning they may fall off the stage). When picked, it will, just like in the original series, grant the player invincibility. However, the player will be unable to damage opponents simply by touching them.