This will drive you nuts. The site instructions are in Japanese, so read below!

1. Touch 'start'

2. Wait for 3, 2, 1.

3. Memorize the number's position on the screen, and then click the circle from the smallest number to the biggest number.

4. At the end of game, the computer will tell you the age of your brain.

5. Forward the message and type your calculated age in the subject line.

Forward it to your friends and include me.

Good luck!