Today’s list contains not one but two checkers games for iPad that have gone free, and two iPhone games that are free for the first time ever. Slay ($4.99 -> Free): A strategy game that requires you to conquer territories. Slay looks simple on the surface, but there is a well-balanced turn-based strategy game underneath it all.  In the game the island is divided up between six AI controlled players, and you must capture your opponent’s territory and link it up with your own to create more powerful ones.