GREE acquired Jason Citron's OpenFeint in 2011.
OpenFeint was a social platform and software-development kit that let mobile games add achievements, leaderboards, friends lists, and other community features. Jason Citron founded the service through his company Aurora Feint before later creating Discord.
The Japanese social-gaming company GREE bought OpenFeint in 2011 for $104 million. The acquisition came as OpenFeint faced monetization pressure and competition from Apple's Game Center, which had been introduced for iOS games.
OpenFeint had expanded beyond Apple devices by supporting Android, and it had become a widely used layer for mobile games. GREE ultimately discontinued the service on December 14, 2012, favoring its own platform. Citron used the proceeds from the sale to help found Hammer & Chisel in 2012, the studio whose later work led to Discord. Tencent, DeNA, and Zynga were not the acquiring company in this transaction.