System 3 Software Limited (known as System 3 Software Ltd. until 1991 and Studio 3 Interactive Entertainment Ltd. from 1999 to 2003) is a British independent video game developer and publisher founded in 1982 by Mark Cale.^[1]

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System 3 Software Limited

Formerly	Studio 3 Interactive Entertainment Limited (1999-2003)
Company type	Public
Industry	Video games
Founded	1982; 42 years ago (1982)
Founders	Mark Cale Emerson Best Michael Koo
Headquarters	London, United Kingdom
Key people	Mark Cale (CEO)
Products	Last Ninja series International Karate series Constructor Putty
Website	http://www.system3.com/

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They created such games as The Last Ninja, Myth: History in the Making, International Karate, Putty, Constructor and its 1999 sequel Street Wars: Constructor Underworld (also known as Mob Rule) as well as dozens of other games.

Studio 3 was the internal development arm of System 3.^[2]