I bet NAMCO would have loved to sue them. With Google's big fat wallets they're a mouthwatering target for lawyers. They'd probably win too. Imagine the settlement theyd get for all the millions and millions of people that played it. But no, There's no way Google would have made that without permission. They're not stupid. I expect they paid NAMCO a hefty sum for the right to make that. It shows how Google is willing to spend serious cash purely to show off how awesome they are. For all the great publicity it got them, I'd say it was well worth the investment.