In the Mensa IQ Check app, the same kind of puzzles keeps coming back. I don't know how to solve it. Can anyone help me?
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From the six columns only the fourth contains the same symbol 3 times, namely the symbol $O$. In addition to that, none of the rows contains the same symbol 3 times. If we replace the question mark which is on fourth row with the symbol $X$ then on the fourth row the symbol $X$ appears 3 times as well.
It could be @
The outer two columns have patterns that are copies of each other, with symbols changed. The same is true for the inner 2 columns. If we use @ instead of ? this pattern would be true for column 2 and 5 as well.
I think the solution from @MacGyver88 is nicer than this solution, although any of them could be valid.