Easy to learn game is both fun and challenging. Levels can be completed in just a few minutes, so the game is perfect to play while waiting in line, etc. I found it addictive, though, so I did play continuously for hours at first! Thank you very much to the developer!

By unsolvable, I mean several of the boxes overlap, and when you move one to the right, it actually moves to the left and outside of the playing area, or move one up and it moves down outside the playing area. Been waiting for a long time to see if this ever got fixed. It is level 37 expert, and I see a double wide piece that I had not seen in any of the prior levels. It overlaps with two other pieces, so both are occupying the same spaces.

The great help system you can always try using it and the free help just reset after a few minutes.

This is a nice cerebral relaxing slow-paced game when I just need to chill out a bit and yet feel good about myself.