Memory Game

So several months ago I found a cool Toy Story memory game on my iPhone. Oliver was starting to get more interested in my phone so I thought he might enjoy seeing the characters. He liked it right away. It started with me holding his finger and I'd help him find all the matches. Eventually he started poking around and occasionally got a match (mostly by accident). Usually he'd get frustrated, grab my finger and make me find the matches. He at least recognized that the matched tiles were disappearing and he understood that that was good. Then about a month ago I gave him my phone (by this time he could easily navigate his way to the game to open it) and I noticed he wasn't grabbing my hand to help him. I also noticed that he had found a match. I started watching as he flips 2 tiles that don't match, then the next one he flipped he recognized that he had just seen its match, so he remembered where and got the match. Still I thought he was getting somewhat lucky. About 3 minutes and 15 seconds later he had solved the puzzle! Then he did it again and beat his record (2:45). He amazed us with his memory and has since then beat his time to close to 2 minutes. What an amazing boy. So smart like his mommy. I'm in search of other games that he'll enjoy while they challenge his mind. If you have any suggestions I'd love to hear them. I just hope this doesn't translate to mindless texting in later years. But as for now he is our little professor.