I made this simple puzzle a couple of years ago. There are three colors which appear in every row and every column. Moreover, every color appears 5 or 6 times in total. Find the color of the square with the question mark.
Answer
I get:
Top right is fairly obvious, the 3rd row needs a red and green, and the red can't go in column 2.
Top row and last column now need red/green, and first column, last row need a blue, so the blues go.
Now we have 6 blues, and so we must have 5 reds and 5 greens. As top row/last column both need red/green, this gives us 5 reds, so ? is green.
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