The cyan R.O.B.'s down special, Gyro is based on the spinning gyros used in Gyromite, which requires the real-life R.O.B. accessory to play.
The cyan Giant R.O.B. and the stage reference how R.O.B. is a real-life video game peripheral required to play Gyromite.
Other trivia:
This spirit's Back Shield Equipped ability references R.O.B.'s usage of Gyro, where charging it will leave his back exposed to attacks.
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One of R.O.B.’s two compatible games, Gyromite puts the player in control of Professor Hector, frantically trying to defuse bombs around his laboratory. However, he needs R.O.B.’s help, as only the robot can move the columns blocking Hector’s way. Using the spinning Gyros, R.O.B. hits the red and blue buttons in the real world, affecting the path inside the game!
