Heroes of Newerth (HoN) is a multiplayer online battle arena (MOBA) video game originally developed by S2 Games for Microsoft Windows, Mac OS X, and Linux. The game idea was derived from the Warcraft III: The Frozen Throne custom map Defense of the Ancients and was S2 Games' first MOBA title. The game was released on May 12, 2010, and re-released as a free-to-play game on July 29, 2011. On May 5, 2015, Heroes of Newerth was acquired by Frostburn Studios, with the development team moving over to the new company.