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Robo Beam is R.O.B.'s neutral special move in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U. When used, R.O.B. fires a laser beam from its eyes that travels through opponents. The shot can be angled up or down with the control stick and reflect off of the floors or walls, and using the beam closer to opponents causes them fire damage. Firing again right after firing once causes the beam to be a close-range attack. Holding the Robo Beam for a period of time turns the shot into the Super Robo Beam, a larger and more powerful shot that travels across the entire stage. The levels of charge are determined by the LED on R.O.B.'s head; it glows brighter and blinks faster when the normal Robo Beam can be used, and it glows and blinks even more, in addition to a sound playing, when the Super Robo Beam is available.
In Super Smash Bros. for Nintendo 3DS / Wii U Robo Beam has two customizable variations that can be unlocked and switched out. The first custom move is Wide-Angle Beam, which allows R.O.B. to fire a less-powerful beam at wider angles. The second is Infinite Robo Beam, which allows R.O.B. to fire the standard Robo Beam at any point, but it takes longer to charge the Super Robo Beam, the attack itself is weaker, and the laser can no longer bounce off walls.