Trainyard is a fantastic puzzle-solving game for iPhone, iTouch, and iPad users. In a nutshell, you move colored trains from their origination point to their destination by laying out railroad tracks. It begins simply, but soon becomes enormously complex. I got the free version and found it so enjoyable I took the very rare step, for me, of paying $.99 for the full version.
I solved all the puzzles, but have to admit I cheated on a couple of them because I was totally stumped. There are user solutions on the Web site. My own solutions usually weren’t as elegant as the ones posted there, but they got the job done.
This game will give you hours of frustration, but wonderful moments of pleasure as you find a solution to each puzzle. Very highly recommended.