I created a very special series of jig-saw puzzles. In order to try them you must register by giving a first and last name (email is optional) but you don’t have to use your real name or even the pseudo-name we know you by, but whatever name you choose, please write it down somewhere safe so you’ll remember it for next time I post one of these tests which will likely be very soon. If you already took the crossword test, try to use the same name you used to register for that.

By using the same name every time you take a test, not only can you build a diagnostically informative cognitive profile, but you allow me to calculate how well my tests intercorrelate.

So what makes this spatial test so special? Your score is simply the number of pieces in the hardest puzzle you can solve in 2 minutes. If you can’t solve any puzzle in 2 minutes, your score is simply the number of pieces you connect in 2 minutes on the easiest one.

Because your score is literally the number of pieces you can connect in 2 minutes, this test measures spatial ability on an absolute scale with a true zero point. So someone who can solve the 8 piece puzzle in 2 minutes can be roughly considered 33% more spatially intelligent than someone who can only solve the 6 piece puzzle in 2 minutes.

This is rare chance to study the true distribution of cognition on an absolute scale.