Dota 2 is a multiplayer online battle arena developed by Valve and successor to the popular Defense of the Ancients modification for Warcraft 3. The game was released on July 9, 2013 in a free-to-play model for Windows. Versions for macOS and Linux followed after a one-week test phase. Dota 2 is available exclusively via Valve’s Steam distribution platform. Designer of the game is IceFrog, a long-time co-developer of the predecessor, who only appears under a pseudonym. With over 276 million US dollars, more prize money has been paid out in Dota 2 than in any other e-sports title. The game is one of the most played titles on the Steam gaming platform.