Color Sensation - Color differ

Select different color from color grid of color circles.
It is easy at the beginning, but afterwards it is getting hard and depends on your sense of color.
The game is getting harder and harder on every stage by minimizing color differences.
Number of circles increases and size of circles are also getting smaller and count of blocks increases on every stage.There are two modes- Count down mode- Free modePlease rest your eyes after every 5 or 10 plays.