Yes. The creators of this site, Chuckra, are famous for providing free educational resources. The site is completely free to use.

No. You can play all of our games without registering. However, if you do not register then you will not be able to compare your performance to other people or find your personal Brain Score. It's free to sign up so please do!

Your Brain Score is a measure of how well you performed compared to everyone else. It tells you what percentage of people scored below you (Percentile Rank). For example if you have a Brain Score of 78, it means that you scored better than 78% of the other people taking part in the Brain Experiment.

Also see Brain Score Quality (BSQ) below.

Brain Score Quality (BSQ) is an indication of how many DIFFERENT games you have played. If you had played all games your Brain Score Quality would be 100%. If you had played half the games then your BSQ would be 50% etc. This is an easy way to see how valid a person's Brain Score is. The higher the BSQ the more thorough the brain training has been.

The colors are a quick way to see how well you are doing. Red is bad, yellow is average and green is good. Aim to get all your scores in the green.

This color scheme applies to game scores and game tags.

You will find full scoring history and performance data in the My Brain section of the site (top menu)

Due to the volume of traffic we have to take certain measures to increase website performance. High score data is refreshed every 15 minutes so if you wait a short while your high score will be acknowledged.