What is in the blank box? Why? Pick from one of the five options.

enter image description here

For folks who don't see colors well

Y = yellow, R = red, O = orange, B = blue, G = green, P = purple




R B R & B Y R
  • $\begingroup$ Obviously the puzzle is full of colors. I did not think of "color blind" solvers. I apologize. Is there something I can do for that? $\endgroup$
    – DrD
    Dec 30, 2020 at 13:41
  • 3
    $\begingroup$ "What is in the blank box?" Nothing. You said its blank. $\endgroup$
    – Ankit
    Dec 30, 2020 at 19:58
  • 2
    $\begingroup$ @Ak. I appreciate your bounty. But I'm ok with ducvu getting the check. He did after all figure out that the last row was chemical elements. But thanks anyways :) $\endgroup$ Jan 3, 2021 at 18:36
  • 2
    $\begingroup$ Very well put @Prim3numbah. Appreciate you saying this. $\endgroup$
    – DrD
    Jan 3, 2021 at 20:49
  • 1
    $\begingroup$ @Prim3numbah You're welcome =) $\endgroup$
    – 19aksh
    Jan 4, 2021 at 1:40

3 Answers 3


enter image description here

Credits to @Prim3numbah for

aptly enough, finding out the sequence is prime

  • 2
    $\begingroup$ Aaah, well done! Got stuck on the last row for quite sometime $\endgroup$ Dec 30, 2020 at 23:19
  • $\begingroup$ Wondrfully explained $\endgroup$
    – DrD
    Dec 30, 2020 at 23:25
  • $\begingroup$ Even though you borrowed heavily from PrimeNumbah's answer that graph is very pretty to look at +1. $\endgroup$ Dec 30, 2020 at 23:25

I believe the answer is

Option E


First to notice is that the first two columns color are added and make the color in the 3rd column. Yellow + Red = Orange, Yellow + blue = Green, [Red] + blue = Purple. So we're looking for a red figure. Second to notice is that these are the prime numbers! from 2-13 (note, upside down roman numeral, V) , reading from left to right row for row.. So one might think the missing figure should resemble the number seventeen and that the two next entries should represent 19 and 23 but there is no resemblance. Now, here's where the non-sensa part come in, I believe. The last row could be obtained by converting the number above to it's corresponding letter and then rotate this shape/letter 180 degrees in comparison to the figure above (note that two lines of each letter is missing). In that case we get a "G" by adding two more lines.

  • $\begingroup$ O So close. Terng ybtvp nobhg pbybef naq cevzr ahzoref. Guvax uneq nobhg gur friragrra, avagrra naq gjragl guerr. Nal bgure cynpr gurl pna or sebz? $\endgroup$
    – DrD
    Dec 30, 2020 at 22:30
  • 1
    $\begingroup$ Nice one, I was just about to give this puzzle a go but you already more or less solved it! $\endgroup$ Dec 30, 2020 at 23:24

I think the answer is

D aka the yellow diagonal [|

Reasoning (color):

I couldn't help but notice that the 2nd collumn has 2 colors, and the 3rd has 3 colors. D fits this. Further, each row has 3 different colors. A, D or E fit here

Reasoning (shape):

If you count how many edge midpoints and corner points are contained in each picture, you get {4,4,3},{2,4,5},{__,4,3}. Row 1 & 2 add up to 11. A, C, or D fits here.

D is the only one that fits in all these patterns.

  • $\begingroup$ hello @Ankit. There is a lot more going on in the puzzle. rot13yrggref, ahzoref, cnggrea $\endgroup$
    – DrD
    Dec 30, 2020 at 20:45

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