Stack Up (also known as Robot Block) is a puzzle video game developed and published by Nintendo for the Nintendo Entertainment System (NES) in 1985. In the game, players control a robot named R.O.B. (Robotic Operating Buddy) to manipulate blocks and stack them in a specific pattern within a set time limit. The game utilizes R.O.B.'s physical peripherals, such as his arms and spinning top, which are operated through infrared signals from the NES console. Stack Up was primarily marketed as a showcase for R.O.B. and served as one of the peripheral's few games before it was discontinued.
