Brain.exe (1.15MB) is a simple test from Brain Works that exploits the fact that brain activity is separated into functionalities. Different activities occur in the left and the right side of the brain. In addition, this test indicates whether a subject tends to tackle learning experiences in an auditory or visual manner. This one is fun to do.

Ansir.com claims to have one of the most comprehensive personality tests. It is indeed complete, but also long and far too serious for a Sunday morning play about.