Robot Unicorn Attack is an endless running video game released by Spritonin Media Games on February 4, 2010. In the first week after its release, the game garnered one million plays. Following Robot Unicorn Attack, Adult Swim released three follow-ups, titled Heavy Metal, Christmas Edition, and Evolution. As part of the Robot Unicorn Attack series, a sequel was developed and released by PikPok for iOS and Android on April 25, 2013, and July 12, 2013, respectively. Robot Unicorn Attack Forever for iOS, a third game rendered in full 3D, was released on April 27, 2017.