Good at what it's doing! Could be better at guiding you through the game. Sometimes feels like you stumble on a solution, rather than cracking the puzzle. It also doesn't let you skip puzzles, which isn't great for this. It would be nice to skip a puzzle and come back to it if you're stuck; seems like a standard feature. Needs options for color-blind people, too (I'm not, I just think it's important :P).