If you're into logic games, this one is fantastic, and sickeningly addictive. It's a little challenging at first (I'm okay with that - this usually means I probably won't get tired of it, and this has proven to be oh-so true with this game), but once you get the logic behind it, it's play, play, play! (OMG - make me stop!) The one thing I wish they'd add is the ability to restart a game, or even just a way to wipe the board with one click, so I don't have to undo it all manually. I see in the update that there are now undo arrows, but that still seems to just undo a step at a time. Once I've followed a particular rabbit trail to nowhere, I'd like to be able play the same board, but from scratch. Thanks for this really marvelous game!!