From the Super Mario Wiki, the Mario encyclopedia
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Roto-discs (also spelled Rotodiscs, Roto-Discs, Roto Discs, or simply Discs) are Fire-Bar-like obstacles that first appear in Super Mario Bros. 3. Roto-discs are found orbiting gray or red orbs, on which it is possible for Mario or Luigi to stand. Roto-discs are nearly invulnerable; they can only be destroyed if the player transforms into a statue by using the Tanooki Suit and lands on top of one. Duo-Roto-Discs can also be found, which consist of two Roto-discs circling the central orb. If the player destroys one using the Tanooki Suit, the other will disappear.
Aside from Super Mario Bros. 3 and its subsequent remakes, the only other appearance of Rotodiscs is in the Mini-Mario course in Bowser's Castle in Mario & Luigi: Superstar Saga and Mario & Luigi: Superstar Saga + Bowser's Minions. As a throwback to the previous games, they are obstacles that will send Mario back to the beginning of the area if they connect with him.
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