How are you with colors?
It shouldn't be too hard to choose to toned colors gradually approaching each other.
What about colors are above the circle rotating at different speeds and shapes?
When you using the left lobe of the brain for mathematical calculations such as speed and direction of rotation of circle, also you will need to use to the right lobe of the brain for find different color.
If you're tired of old fashioned intelligence tests, here's your chance.
Make the best score by passing your intelligence to your fingers, show who is smarter than other players.
3 different circle system.
A color engine that produces more than 1200 colors.
6 different increasingly challenging level system.
Combo system which you can fold your points with your speed.