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In page Half-Life (video game):
"Half-Life received support from independent game developers, supported and encouraged by Valve. With the game, Valve included Worldcraft, the level design tool used during development, and a software development kit, enabling developers to create mods. Both tools were updated with the release of the version 1.1.0.0 patch. Supporting tools (including texture editors, model editors, and level editors such as the multiple engine editor QuArK) were either created or updated to work with Half-Life.[citation needed]
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