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In page Quake (video game):

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Quake can be heavily modified by altering the graphics, audio, or scripting in QuakeC, and has been the focus of many fan-created modifications, known as mods. The first mods were small gameplay fixes and patches initiated by the community, usually enhancements to weapons or gameplay with new enemies. Later mods were more ambitious and resulted in Quake fans creating versions of the game that were drastically different from id Software's original release.[citation needed]