Square, oval, and circle on each line.
With no shading, cross-shading, and half-shading.
Missing on third line, half-shaded square.
It also works if you look at the rows instead of the columns, and if you divide into corners and a diagonal. Regardless of how you slice it up, the lower right corner is “right-half shaded square”.
OK ... THAT makes sense ... and I didn’t see it.
but why one half shaded square versus the other?
“...Missing on third line, half-shaded square.”
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Yes, but WHICH of the two half-shaded squares is the correct one? The difference between IQ of 115 & 145.