Been playing this one a lot last night. For a Video Game Geek like myself it's really an excellent thing!
Fully customisable questions so you can remove or limit it to certain platforms, eras or even genres. Really well done interface (with iPhone 5 support) and I'm interested to see how it pans out with the supposedly dynamic content being fed in with new questions all the time.
All in all it's excellent with some really obscure and tough games to identify. I've already learnt a thing or two and found a couple of iPad re-releases of old PC games that look very interesting, so Apple should really be paying this dev for the covert viral advertising!
Great job - very highly recommended 5/5 from me!