This robot accessory is designed to work with Famicom software with each game coming with original pieces to add to the robot.

The Western version of the robot called R.O.B. came with all the accessories included. The software titles were Robot Gyro and Robot Block, and were simple programs where the robot moved items from one place to the other, while looking at the TV and receiving instructions from flashing colours on the screen, with input from the user via the joypad.

This accessory was released in Japan as Family Computer Robot or Famicom Robot on July 26, 1985 simultaneously with the first game in the series, Robot Block. The second game, Robot Gyro was released in Japan on August 13, 1985.

The robot accessory and its two games was released in North America simultaneously on October 18, 1985, but the accessory was renamed R.O.B., short for Robotic Operating Buddy, and the two games Stack-Up and Gyromite. All three were released in Europe in September 1986.

There was a pack in version of the game released in the USA and Europe, the games although released under different names in the west were the same, and identified as the Robot Series on the box, and their on screen names were left unchanged.

Regarding the games' universe, it is stated that the R.O.B. was created by Professors Hector and Vector, characters from the games, and they also command it during gameplay, so the robot itself and the events from the games are supposed to exist in the same fictional universe, in some way.