Foritensum is an incredibly difficult logical/IQ test. What makes it interesting is that you don’t need any previous knowledge, and anyone can give it a try. As the author says in its homepage:
Foritensum is what some people would call an IQ test. It was inspired by Logima Strictica 36 by Robert Lato. I have tried to come up with a good mix of problems, some of them hard and others extremely difficult. Foritensum is meant to be culture fair; an alien from a different planet should have the same chance to score well as someone raised and living in the western world.
Give it a try! The rules are simple, 1) No time limit and 2) Do not discuss solutions with anyone
