Good game! Needs a couple things.

I like this game a lot! The concept is very good, the game functions well, and I find completing the puzzles very rewarding.

Unfortunately, I find that the current hint system takes away from the satisfaction of completing the puzzles that I find harder to complete. I would rather that the puzzle doesnt complete itself for me every time I use the hint button. I feel that the hint system can be revised in a number of ways. It could highlight which piece to move first, which piece is last to fall, displaying how many times a piece needs to move to complete the puzzle, or even simply limit how many hints can be used per puzzle. If players prefer the current system, they could change it in a settings menu.

I wouldnt mind a graphical upgrade either.

Besides those two things, this is a very solid game!

Jacob McKnight about Solitaire Chess by ThinkFun