Roto-discs[1] (also spelled Rotodiscs[2], Roto-Discs[3][4][5], Roto Discs[6][7], or simply Discs[8]) 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[9] 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.
In Wario's Woods for the SNES, after activating a combo, an energy orb appears and refills Birdo's time gauge. The sprite used for the orb is the same as the Roto-discs, only with a different palette.[13]
^Peterson, Erik. The Super Mario Advance 4: Super Mario Bros. 3 Player's Guide, page 15.
^Hodgson, David S J. Super Mario Advance 4: Super Mario Bros. 3 Prima's Official Strategy Guide. Pages 20, 29, 30, 45, 49, 50, 60, 66, 67, 76, 77, 82, 85, 96, 97, 104, 105, 106.
^Nintendo Power Volume 13, pages 46, 54, 55, 60, 70.
* Exclusive to Mario & Luigi: Superstar Saga. • ** Exclusive to Mario & Luigi: Superstar Saga + Bowser's Minions. † Enemy, boss, or stat exclusive to the main game. • †† Enemy, boss, or stat exclusive to Minion Quest: The Search for Bowser. • ††† Enemy variants differ in Mario & Luigi: Superstar Saga + Bowser's Minions.