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Gyro is R.O.B.'s down special move in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U, based on the gyro accessories that the actual R.O.B. uses to play Gyromite. R.O.B. charges the attack by spinning the gyro in place on a stand, similar to how it uses an actual gyro; the charge can be stopped by using another button. Pressing the button again causes it to toss the gyro, the distance and power determined by how long it charged. After R.O.B. tosses the gyro and it lands on the ground, it spins in place for a time until it disappears; while it is active opponents who run into the gyro receive damage as long as it is spinning. R.O.B. can pick up the active gyro, while opponents can catch it while it is in the air.
In Super Smash Bros. for Nintendo 3DS / Wii U, this move has two custom variants. The first is Fire Gyro, which tosses a flaming gyro that deals more damage but does not travel as far. The second is Slip Gyro, which tosses a gyro that spins across the ground and trips any opponents that are hit by it.