It is written in Chinese except for the numbers so here are the instructions.
1. Touch 'start' in the square
2. A countdown will begin: 3, 2, 1. then the numbers will pop up
3. Memorize the number's position on the screen, then click the circle from the SMALLEST number to the LARGEST number.
4. At the end of game, computer will tell you how old your brain.
http://flashfabrica.com/f_learning/brain/brain.html