(stylized as [PROTOTYPE]) is an open world action-adventure video game developed by Radical Entertainment and published by Activision. The game was released in North America on June 9, 2009 (PlayStation 3 and Xbox 360), in southwestern parts of North America (Microsoft Windows) as well as Oceania on June 10, and in Europe on June 12. Versions for PlayStation 4 and Xbox One were released on July 14, 2015 alongside the sequel as Prototype Biohazard Bundle. Separate versions of the games became available in August 2015.
Set in Manhattan, the game follows a powerful amnesiac shapeshifter named Alex Mercer who must stop an outbreak of Blacklight, a plague that mutates individuals into hideous violent monsters. During his quest, Alex tries to uncover his past while also coming into conflict with both the US military and a black operations force called Blackwatch. Parallel to the game's storyline is the ability to play the game as a sandbox-style video game giving the player freedom to roam Manhattan.
The game was a critical and commercial success, with critics praising the game for its originality and engaging gameplay. Many reviewers compared and contrasted it with Infamous, another open world action-adventure game released one month prior to Prototype. A sequel, Prototype 2, was released in April 2012.