How good is yourcolor vision? Color Challenge app will test the quality of your color vision. You need to identify one tile which is not the same color with the other tiles. Players get just 30 seconds to find the odd square on each board before the timer runs out and the game ends. Scores: 11-15 is extremely bad, 15-20 is lower than normal, 21-30 is normal, and over 31 is amazing eyesight. Easy to play, self described puzzle game!