It's hard to believe how such a simple change in game mechanics makes this already-addictive game into something frighteningly un-put-downable. If you dig simple but endlessly entertaining puzzle games it's very hard to do better than this one.

It's hard to believe how such a simple change in game mechanics makes this already-addictive game into something frighteningly un-put-downable. If you dig simple but endlessly entertaining puzzle games it's very hard to do better than this one.