Was 5 stars, but I'm a bit colorblind and I ran into color-coded puzzles in each of the 4 games I tried. In each case, the colors were not different enough for me to get anywhere without buying stars to skip the puzzle. For devs, it's really not hard to get that level of accessibility, just give a b/w pattern setting for certain puzzles. I had to brute force the animal eye color puzzle in Sultan but overall it was better than the other games for color puzzles.