Video game clone grouped as "Myst clones". Some video game genres are founded by archetypal games of which all subsequent similar games are considered derivatives; notably, early first-person shooters were often called ""Doom" clones", while the success of the open-world formula in "Grand Theft Auto" led to the genre of GTA clones. The genre of endless runners is based on the success and simplicity of the game "Canabalt". In these cases, games that are "clones" of another are generally not implied to have committed any intellectual property infractions, and otherwise considered legally acceptable practices, although calling such games clones is generally considered derogatory.
Salamander (video game) Salamander (video game) , retitled in North America and in the Japanese arcade re-release, in Europe known as "Life Force: Salamander", is a scrolling shooter arcade game by Konami. Released in 1986 as a spin-off of "Gradius", "Salamander" introduced a simplified power-up system, two-player cooperative gameplay and both horizontally and vertically scrolling stages. Some of these later became the norm for future "Gradius" games. "Salamander" was followed with a sequel in 1996 entitled "Salamander 2". The first player controls Vic Viper and the second player takes the reins of debuting spacecraft Lord British, which is sometimes referred to as "Road