The code turns off collision detection, an entirely separate toggle. The equivalent code for a game may also turn off clipping, but this is not the reason why the player can walk through walls. This source of god modes often manifests itself in the route by which players activate these modes – for example, running a game with a development mode flag. If a new feature is implemented in a game but requires play to determine whether it works, it saves time if a developer can quickly reach the relevant portion of the game by avoiding death or by 'flying' over time-consuming regions of the game environment. Noclip modes (and similar modes) often originate as a means by which developers test games. The first instance of noclip code came from id Software's popular game series Commander Keen. John Carmack of id Software has told fans that he derived the term from the concept of 'clipping a movement vector'. The cheat is commonplace, particularly in action-oriented first-person shooters such as Quake or Half-Life. The name is derived from the command traditionally used to activate it: typing 'idclip' in the game's command PC game console for Doom II (the previous one was 'idspispopd'). The term was popularized by the games of id Software in the 1990s.

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