 Non-violent first-person shooter developers have expressed the notion that it is the challenge of making a non-violent game in a violent genre that motivates them in part.Rarely, FPS games such as "Garry's Mod" and "Portal" that have been developed without the specific intent of non-violence have been identified by reviewers and the non-violent gaming community as non-violent FPSes.Such characterizations have led to the concern that parents may allow their children to play these games, not realizing that there are still some elements of violence including violent deaths.