Nice puzzles, but the ad for the app is very misleading. The ad shows plenty of space around the puzzle to group similar colors. In reality, the only space for grouping like colors is inside the puzzle or on top of the border after you assemble it. Also, the frequency of ads was reasonable during the first puzzle, but they increased to EVERY TWO MINUTES during the second puzzle! Absolutely outrageous, and I will uninstall this app as so as I post this!