Irrational Games, the studio that makes BioShock, is shutting down. BioShock creator Ken Levine said today that he plans to move on to smaller, narrative-heavy games that will be released digitally.

Levine, who ran Irrational, announced the news on the Irrational Games website today, noting that he'll be starting "a smaller, more entrepreneurial endeavor at Take-Two" and laying off all but 15 people.

"While I'm deeply proud of what we've accomplished together, my passion has turned to making a different kind of game than we've done before," Levine wrote. "To meet the challenge ahead, I need to refocus my energy on a smaller team with a flatter structure and a more direct relationship with gamers. In many ways, it will be a return to how we started: a small team making games for the core gaming audience."