Gree has announced that it has purchased OpenFeint for $104 million. The Japanese mobile social gaming platform will combine with the OpenFeint gaming platform to reach 100 million users worldwide, and will look to accelerate the growth of mobile social gaming; over 5,000 games currently use OpenFeint.

“At Gree, we are socializing the next evolution of games and, as the best-in-class U.S.-based mobile social network,” said Yoshikazu Tanaka, founder and CEO of GREE. “OpenFeint is the ideal partner for us to offer the best mobile social games to the largest global audience.”

“We are excited that Gree shares our belief in the OpenFeint network and are ecstatic to partner with a renowned global leader to build a multi-billion dollar business,” says Jason Citron, CEO and founder of OpenFeint. “Together, we will deliver the strongest global ecosystem of gaming networks to our combined 100 million users.”