Last Saturday was the 20th Anniversary of the launch of Castle Wolfenstein. To celebrate, iD Software has made the iOS version of this game free for a limited time.

If you're interested, you really ought to hurry. iD didn't try very hard to get the word out about this, and I only learned about it today. It's possible this deal is going to disappear soon.

I played all the way through Wolfenstein on an iPod touch a couple years ago, and I think it has stood up well to the test of time. This is certainly the game that defined RPG. I personally am not a fan of turn-based RPGs, but YMMV.