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In page Quake II:

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As with the original Quake, Quake II was designed to allow players to easily create custom content. A large number of mods, maps, graphics such as player models and skins, and sound effects were created and distributed to others free of charge via the Internet.[1] Popular websites such as PlanetQuake and Telefragged allowed players to gain access to custom content. Another improvement over Quake was that it was easier to select custom player models, skins, and sound effects because they could be selected from an in-game menu.[citation needed]