Games like Mystery P.I for DS and PC?

If you don't know, Mystery P.I is a "Find the Hidden Objects" PC game. I got it in the Popcap games collection and I loved it. I also love those spot the difference kind of games, one of which I unlocked in one of the Mystery P.I games. Anyone know any good "Find the Hidden Objects" and Spot the Difference games for PC and DS?

Where's Waldo.I Spy.