Fifty (49+1) Shades is both a game and an eye color sensitivity/separation test. You can take a conquest with other players, or you can check how good you in visual colors separation. Suitable for car drivers, graphics designers, painters and artists, or even opticians.
On each move (Stage), you have to select a color closest to reference color, placed in the center. The closest color you choose, the smallest penalty you get. Penalty is the number of shades you miss while selecting a closest shade. On each move, penalty is subtracted form Shades bank (initially you have 50 Shades). Zero Shades left means Game Over.
Good luck!