i've enough complicated stuff working my brain. I don't really play games much but the iPad is allowing me to re-live space invaders - see that's simple, and pinball even simpler :D
i have played them,yeah,they are nice
Pinball HD and Card Shark
If you like Risk type games, try Lux Touch (free, but there's also a paid version). I played it on the iPhone a lot last year...haven't tried it on the iPad yet.