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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?

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  • $\begingroup$ 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". $\endgroup$ – Gareth McCaughan♦ Dec 12 '19 at 1:03
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Partial answer:

For the second problem, the answer could be:
enter image description here
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.

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  • $\begingroup$ I think you might be on to something. Think it fits logically actually. We need your brain also on the first matrix and/or here <puzzling.stackexchange.com/questions/91452/…> Also sequential. $\endgroup$ – Erin Nov 23 '19 at 13:19

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