 Often modeled upon violent FPS games, non-violent FPSes such as "Chex Quest" or the newer Sherlock Holmes games, may bear striking resemblance to the violent game whose engine they are using.Developers of such games often have done little to change the game other than replacing violent or scary imagery and recasting the storyline to describe "zorching", "slobbing", or otherwise non-lethally incapacitating enemies.Examples of simple changes intended to reduce violence for non-violent FPSes include the alteration of the red shroud from the death-sequence in "Doom" to become the green shroud from the slime-sequence in "Chex Quest" or the removal of the red shroud from the death-sequence in "Half-Life 2" for the deaths in "Portal".