I found this game very excellent and a simple test. Look at the image and then click at the LAST circle that appeared on every level. For example when you click on the video, it will start Level 1 , click on the white circle then it will move to level 2. When you click on the right circle you are allowed to go to next level. The higher level you get the better your visual memory are...hahaha..I have to admit I have a very bad visual memory, I play this game like 10 times and the maximin level I got is 13 hahaha...

Have fun with it
Put your results into the comments ;), tell me which level you got and it will be fun if you are honest hahaha