The gameplay is wonderfully simple and engaging. It feels very much like the sort of Solitaire game that I'd play while waiting for class to finish or something like that. Simple rules but it definitely requires looking ahead and thinking, keeping the mind engaged. My only real complaint about the game as presented is that there is no way to 'undo' a misclicked selection. That is, if I hit right, but don't actually want to use that card, I can't unselect it to pick a different one. A arrow-then-enter or arrow-then-space to confirm selections would be a little more user-friendly.