Triple Dots app for iPhone and iPad
A board game with simple rules but tricky to master. You can play it on a quarter of your chessboard, 4 white and 4 black pawns. Now, you can play it on your iPhone too.
You can set how smart your iPhone is: Easy and Normal levels are free of charge. There is a one time fee to play on the Hard level. Be warned though, it’s not so easy to win when playing Hard :)