Rogo It is original and totally suited to the iPhone. You can do a little bit at a time and it doesn't matter if you have to stop to get off the bus etc. It is suitable for all ages. The gameplay is really soothing too. The music is lovely and the final reward is SO worth it.

Cross Fingers The interface has a lovely look to it, and it uses the multi-touch capacity of the iPhone really well. The puzzles are not too hard, but still fun to complete. It feels good.

PathPix I really love the colours in this puzzle. I like that you get a beautiful picture at the end. Some of the puzzles are rather easy, but it is still worth it to get the sayings at the end of each one.

Trainyard I like watching the trains go along their tracks, and seeing if they change colour the way they are supposed to. The challenge level is good - tricky but not unattainable, and if you want to be really smart you can try to do the shortest solution.

Drop7 This has lovely graphics, and has an interesting premise - getting the correct number of numbers. I had to take it off my phone in the end, as it was taking too much of my time.

Connext Again it has a pleasing interface, and it is very satisfying when you make a loop. Doesn't have the sense of completion I enjoy, but still nicely done.