1. Touch 'start'
2. Wait for 3, 2, 1.
3. A series of numbers will appear - very quickly - on the screen and then disappear.
4. Quickly memorize the number's position on the screen, then click each circle from the smallest number to the biggest number.
5 . At the end of game, computer will tell you how old your brain is.
http://flashfabrica.com/f_learning/brain/brain.html