pop & funWikipedia2003

A fan-made Warcraft III map called DotA became the blueprint for the whole MOBA genre

the gist

Defense of the Ancients began as a fan-made mod for Warcraft III. Each team controls powerful heroes and tries to destroy the other side's Ancient, a heavily guarded structure at the far corner of the map. Heroes level up during a match, and players buy items with gold, borrowing from role-playing games. The design grew out of an earlier StarCraft custom map and was refined over many versions. The mod became a fixture at major tournaments and is widely credited as the main inspiration for the multiplayer online battle arena genre. Valve later acquired the rights and built Dota 2 from it.

so what

Many competitive online games borrow DotA's structure, so a fan project helped define a genre that now fills esports calendars.

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