Good, but bug got me.
I thought it was great. I really liked it. Reminded me of an old PC game I use to like. I found the same error as the guy below me at the same time. I accidently clicked 'prev' as I was half way through a puzzle, when I came back I had lost the pieces I had placed on the board. I still had the pieces in my inventory I had not used, but even the clear button didnt give my pieces back. Still this is a clever game and I think its worth your time. Good game guys.