"I'm particularly pleased with the tremendous market response to 2K's BioShock," said Zelnick. "It is reported we are the top-selling title at GameStop, less than a month since launch. We have already shipped more than 1.5 million units. Clearly we have a new hit franchise on our hands. And this one was developed internally and we own the IP. We're proving our ability to diversify Take-Two's product portfolio."