Touch-screen technology has changed the face of gaming by moving the player interface beyond button mashing into the nuance of sliding, flicking and multi finger gestures. The shape game "Cross Fingers" brings these developments to traditional tangram puzzles by having users slide small pieces of simulated wood on a flat board to match an underlying design. Developer Mobigame has put together an array of over 300 designs to work towards, ranging in complexity from two simple shapes to large constructions involving sliding bricks and chain reactions. The more difficult levels of the game force the user to visualize the consequences of moving interlocking pieces and are a fun challenge to the mind. The name "Cross Fingers" is derived from the touch-screen interaction on the iPod/iPad. In some puzzles the player has to move springs with one hand while shifting blocks with the other, leaving the fingers in a tangle like a tiny set of limbs in a game of Twister. Sample gameplay can be viewed in the video below. This game is great for all ages.