Downtown Sacramento’s social game creator KlickNation has been acquired by Electronic Arts. The purchase price was not disclosed, but Inside Social Games says a source tells them it could be up to $35 million after earnouts and retention bonuses.

KlickNation is joining EA’s BioWare division, makers of games like Mass Effect 2 and Star Wars: The Old Republic. The Sacramento team will become BioWare Sacramento, and KlickNation founder Mark Otero will head the newly-formed BioWare Social studio.

KlickNation is privately held and has not reported taking any outside investment. They have 70 employees making Facebook games like Superhero City and Six Gun Galaxy. When the company started building their first games, they bootstrapped by working out of the second floor of Otero’s other venture, a Mochii Yogurt shop. They compensated early employees in equity, and allowed them to earn cash by working in the yogurt shop.