Looks simple but actually complicated - makes you use your brain throughout. A few funny puns as you go along too. I enjoy playing this. Only bug I ran into was when they offered 100 gems for a survey and I got booted out in the middle. Couldn't go back - a message that I had already completed it came up and I never got them. Not even after filing a complaint with the devs. That was the ONLY problem I've run into so far and I've been playing for a couple years, I think...it's been a long time ;