The new snap feature (1.3 Oct 4th) puts this over the edge for playability. No longer are you sitting there carefully moving your finger ever so slightly to put a piece into place as before and with Tanzen (other tangram game). Instead it just quickly snaps where you want it to when it detects an edge. Really makes me want to start solving them and my son and daughter can take a crack at solving them too. I prefer this single tap to rotate a piece rather than rotating a circle as in the Tanzen. When you just do just a couple of puzzles I suppose it doesnt matter but after some time it really starts getting frustrating not to quickly be able to manipulate pieces quick and fast.
5 stars if it got a browsable gallery of shapes. Note: this does not have a flip the pieces like Tanzen does so its the easier for kids. Tanzen doesnt have hint like Tangrams does so you never want to chuck your iphone out the doctors office as a single tap of the hint button will relieve any built up frustration Tangrams might cause you.
mrbass.org about Tangrams