Thanks to everyone who has completed the quiz. The chart below shows the scores for the 47 people who completed the quiz by Dec 9.
You may have done better than you thought you did. The “right” answer for Puzzle 7 was incorrect. It really should be “B”. This has been corrected. Sorry about that.
Retake the quiz if you want to see how you do with the revised scoring.
To improve your 3D thinking, practice!