# Non-Trivial Matrix Puzzles [closed]

Someone said in a random WA group that these are from one of the free online Mensa tests. Exact source unknown. Nobody seem to be able to figure out solid rules, so I thought "Hey, maybe Puzzling is the place. Seen a lot of brainpower here." Any takers?

The images are copyrighted and can not be displayed without permission.

• Closing as "requires attribution", though really the problem is more exactly "requires images, which are no longer here and can't be reproduced here for copyright reasons". – Gareth McCaughan Dec 12 '19 at 1:03

In each row the figure seems to rotate $$90^\circ$$ clockwise from each column to the next. If the figure doesn't have a central dot, a dot and a black semicircle are added. If it has a central dot, the dot and a white semicircle are removed. If we apply this to the bottom row, the last figure in that row becomes the one above.