In 1997, the now-defunct development team Virgin Interactive Entertainment (VIE) released the 2D Space Shooter, SubSpace. Members of the SubSpace development formed Harmless Games LLC and developed Infantry during the late 1990s. Brainscan Development Corporation, also known as Brainscan Interactive, became publisher until GameFan, the parent company of Brainscan Interactive, went bankrupt.
On October 5, 2000 Sony Online Entertainment (SOE) announced its acquisition of Infantry. Harmless Games, and its sole game, Infantry, was bought by SOE from Brainscan Interactive for an undisclosed sum. Infantry lead designer Rod Humble, together with other developers, was offered a job with SOE to continue development of the game. Cosmic Rift (CR), meant to compete with the still popular SubSpace, was developed as an offshoot of Infantry.[4]
In May 2002, SOE introduced a monthly $6.95 pay-to-play system for SOE's three small action games: Infantry, CR and Tanarus; however, both Infantry and Cosmic Rift remained free to play with limitations.[5]
Starting on June 26, 2007, SOE gave full and free online gaming access to Infantry and the rest of their "Station Pass" games.[6][7][8]
On February 29, 2012, via mass-email, Sony Online Entertainment said that they would shut down the Infantry Online servers at the end of March.[9][1]