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User-created WADs, however, are often "PWADs" (Patch WADs)—smaller files that replace or add to the original assets. In the late 1990s, a thriving community on forums like Usenet (alt.games.doom) and CD-ROM collections shared thousands of these homemade levels. Some were masterpieces of design; others were simple, crude boxes filled with monsters.
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Collectively known to digital historians as the "Harris Levels," these modifications were standard, fictional layouts typical of teenage amateur designers of the era. They featured abstract arenas, military bases, and chaotic deathmatch setups.