If you like difficult games, you’ll love Crossbones. This card-matching game might have a pirate’s tenderness when it comes to serving up its learning curve, but once you learn how to play, it’s a fast-paced, thrilling card game that requires some mental agility.

Frogs and rockclimbing? What is this madness? Ancient Games takes an original concept and turns it into a series of difficult puzzles, complete with beautiful, photorealistic graphics and a hundred levels that mix zen with frustration. This might be one of the best puzzles in the App Store.