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I've been stuck on this for ages, and can't figure this out.

What is the missing box, and the logic behind the answer?

I think the answer is

A

Reasoning:

If you look at each diagonal going from top left to bottom right, there appears to be a pattern of opposing ratios in colour, and corresponding ratios in edges.

Let $rm B : W$ be the ratio of Black shapes to White shapes, then the first diagonal (bottom left corner) is $1 : 3$.

Next diagonal (left middle box and bottom middle box) is $4 : 0$ and $0 : 4$ respectively.

Next diagonal (the middle diagonal with the missing box) have the ratios $1 : 3$ and $3 : 1$, so to me it makes sense that the missing box has a ratio of $1 : 3$.

That leaves either

A or F

Due to how the shapes in these boxes are positioned, I am leaning towards

A

But also, in order to explain the colour scheme...

...it has to do with the edges! Here is how we will count them for each shape:

White circle's edges: 0
Black circle's edges: 1
Donut's edges: 2 (because the outer edge and inner edge are accounted for since the donut is coloured black, because the circle coloured black has its outer edge accounted for as well).
All other shapes have the number of edges you see they have.

And then one last rule:

Every shape corresponds to another shape with 4+ the edges (with alternating colour).

Let me explain:

The top left box has a black circle in the top right and the rest are white circles. That leaves a $1 : 0$ edge ratio (in the same ratio form as $rm B : W$ but not in terms of colour anymore). Therefore, the next box in this diagonal (the middle box) must share this same edge ratio.

All the white circles correspond to black diamonds (white circles have 0 edges, 0 + 4 = 4 so the next shape has 4 edges, and the opposite of white is black, so we have black diamonds). So, in the top left box, we replace the white circles with black diamonds, and then change the black circle to a white pentagon (black circles have 1 edge, 1 + 4 = 5 so the next shape has 5 edges, and the opposite of black is white, so this makes the next shape a white pentagon). Now we can maintain our edge ratio, and violá! Lo and behold the box in the middle!

$LARGEstackrelimpliesvphantomprod_n=1^Uparrow$
white circles (0 edges) $to$ black diamonds (0 + 4 edges);
black circles (1 edge) $to$ white pentagons (1 + 4 edges).

Same concept applies for the first parallel diagonals above and below the middle diagonal, if you want to try this pattern with the other boxes!

Get it, now?

Repeating this process in the middle diagonal from our middle box, black diamonds go to white octagons (black 4 $to$ white $8$) and white pentagons go to black nonagons (white 5 $to$ black $9$).

$LARGEstackrelimpliesvphantomprod_n=1^Uparrow$
Recognise the pattern? :)

This is true

for every diagonal. You can count the bottom left corner and top right corner as part of the same diagonal, and the pattern still works.

Thank you @user477343 for solving the puzzle.

I found another(?) pattern. In general the puzzle above follows 2 simple rules:

Rule 1:

Each box increases in the number of shaded shapes in a clock-wise fashion. When all four shapes are shaded, each following box increases in the number of un-shaded shapes in a clock-wise manner.

Let us take the shaded circle in box 1 is the starting point.

(Square 1 to 4) and then decreases the number of shaded shapes (square 5 to 8) in a >!clock-wise manner. Therefore, by simply following this rule, the answer would be A
since it has one shaded shape, which is also in the correct starting position.

Rule 2:

With each increase in shaded shape, there is an also an increase in the number of >!sides (+1) that the newly shaded shapes have.

I don't think this is really an answer. By only looking at the question I arrived at the right answer. It could be luck, but I think the puzzle might be improved slightly...

There is a simple pattern, if the boxes are "read" left-to-right, top-to-bottom. The first one contains shapes containing maximum one side. Block 3 has triangles, 4 has squares, etc. I lazily justified that the second box was "weird" because lines aren't used, but circles in circles ... two sides?


The choices to select an answer from only contain a single selection with a 9-sided polygon.


I'd recommend adding a nonagon to at least one other of the choices :)