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. 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.