Warcraft III: Reign of Chaos is a real-time strategy game set in the high fantasy world of Azeroth. Players control one of four factions, the Human Alliance, Orcish Horde, Night Elves, or Undead Scourge, each with unique units, structures, and hero characters that gain experience and abilities through combat. The single-player campaign follows a sequential narrative across four faction-specific chapters. Multiplayer is supported through Battle.net with ranked matchmaking. The game includes a World Editor that allows players to create custom maps and scenarios, which gave rise to influential community creations including the mod Defense of the Ancients.