Much of the known information about DotA's history comes from a user on Reddit named lestye who has been dubbed the unofficial DOTA historian. They were able to give me a number of different DOTA maps, but none were anywhere near a 1.0 version of the map. The earliest known reference I found was to Defense of the Ancients 2.3 on March 3, 2003. Wargaming101 was the original home of DOTA before playdota.com and later on, DOTA became its own distinct category instead of being lumped in with the other AoS-like maps.

The teams consist of up to five players, each controlling a single hero, and a computer which controls creeps. Standard variants do not support the artificial intelligence (AI) for computer controlled heroes. A variant known as DotA Mercenaries has allowed more computer controlled players, and is commonly used for training purposes or when other human players are not available to play with. Some developers are coming up with test versions of DotA maps with variable-skill AI players. The latest being Cloud_str who created dota allstars 6.27b AI.

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