I had trouble with the "no two identical rows" rule as well. I didn't see it in the tutorial and on the 10 x 10 it was a key piece of logic to solve the puzzle.

I had trouble with the "no two identical rows" rule as well. I didn't see it in the tutorial and on the 10 x 10 it was a key piece of logic to solve the puzzle. Enjoyed the game play and the graphics are very smooth and clean.