Tap only the referrer color which were shown at the beginning of the game while playing. Dont tap any other colors.
You can play Color Blocks in three different modes (Accelerating, 50Step, 30Seconds)
And also, when your eyes tired to choose right color to tap, you can switch to the simplest classic mode to take a breath for a while.
But the real deal was always with the colors.
enjoy, :D