Since its original release, "DotA" has become a feature at several worldwide tournaments, including Blizzard Entertainment's BlizzCon and the Asian World Cyber Games, as well as the Cyberathlete Amateur and CyberEvolution leagues; Gamasutra declared that "DotA" was perhaps the most popular "free, non-supported game mod in the world". Valve Corporation developed the sequel, "Dota 2".