For this puzzle I've made, guess what is the missing color. You can't use a computer to find the solution. But once you know you have it, you are allowed to use a computer, mostly to select a RGB color. I insist on the no-computers tag: it is way too easy if you are able to search on web :)

enter image description here

Hint 1 — 8th of July

Most probably you already saw this set of colors. Moreover, if you saw it, I would bet you saw it first in your childhood.

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    $\begingroup$ I don't think the no-computers tag says you can't search the internet, it seems to say you can't write or use a program to calculate the answer $\endgroup$ – SteveV Jun 30 '20 at 19:37
  • $\begingroup$ @SteveV, thank you for your remark, maybe what I want can be put in "no online decovers"? I wanted that people do not reverse search the colors and the image I used. Is it possible in Puzzling.SE $\endgroup$ – JKHA Jun 30 '20 at 19:50


Colour theory

The left coloumn is:

The set of analogous and complementary colours to red

If the right column is also such a set, the missing colour is:

orange, an analogous colour of yellow, with the green being the other analogous and blue the complimentary

So what's this all about?

Human perception of colour is complex (involving both biology, physics and psychology). But understanding it is also needed for a wide range of things, such as art, design and printing. There are many ways of modelling colour, but in simple models, there's an "opposite colour" ("complementary colour"), providing sort of a "maximum contrast", and also "similar colours" ("analogous colours") that goes well with it. The model used here is probably some simple colour wheel.

  • $\begingroup$ This is a good answer although it is not the one this puzzle needs. I can state it to you by asking, why would I prefer red and yellow? And why red on left and not blue on right? The missing color for this puzzle isn't Orange :) But +1 for the answer I didn't had before creating my puzzle :) Actually, I don't exclude your answer would help finding the true missing color ;) $\endgroup$ – JKHA Jun 30 '20 at 22:51
  • $\begingroup$ How do you define analogous and complementary? $\endgroup$ – the default. Jul 1 '20 at 8:52

New Answer



I've been thinking this was a possibility since day 2, but had trouble linking the green and orange. However, It could work, but is a bit of a stretch. Yellow/Red and Dark Blue/Pink really made this work for me.

The colors correspond to the faces of prominent members of the Sesame Street cast.

My funny answer was cookie color but my real answer is
Black, like the color of Cookie Monster's mouth.

enter image description here

Hint and title - We learn colors as children from these types of shows, and I did first see these characters as a child.

Previous Answer

Violet or Purple


The first thing I did was attempt to rearrange the colors into rainbow order. Violet was missing, Pink was added, and there were 2 blues. So, my first response was Violet. However, it wasn't enough to post an answer.

Then, the idea of rainbows brought me to Rainbow Pride Flags, a fairly common sight in today's world, after which I found this: First Rainbow Pride Flag.

If the darker blue is supposed to be indigo, then these colors are mostly the same: Pink,Red,Orange,Yellow,Green,Blue,Indigo,Violet or the colors of the first Gay Pride Flag or Rainbow Flag.

If the darker blue is not supposed to be indigo, then disregard everything I wrote. (Except the Violet part)

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    $\begingroup$ +1 for the search but there are still some unknown after your answer and it's not the intended one :) $\endgroup$ – JKHA Jul 8 '20 at 15:55
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    $\begingroup$ I've been thinking along exactly the same lines as you on this one...! I'd been trying to associate each individual colour to a particular one, rather than pairing them up like this, but because the 'full set' isn't limited to just 8 I ended up shutting off this avenue of thought. Using them as pairs might just work though, but I'm not yet fully convinced by the precise shades of light blue and tan in your answer as present... Would love to hear from the OP if this is close (or spot on, in fact)! :) $\endgroup$ – Stiv Jul 17 '20 at 13:15
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    $\begingroup$ @Stiv, rit13(jr obgu xabj vg'f abg pbbxvr pbybe.) I think it's the bold. Colors are weird. Blue dress, white dress, it all depends on the light surrounding it. One and three just feel crazy right. $\endgroup$ – MacGyver88 Jul 17 '20 at 13:22
  • $\begingroup$ @JKHA, I posted a new answer since your last comment. Are we any closer? Thanks - :) $\endgroup$ – MacGyver88 Jul 28 '20 at 13:00

The first thing that came to mind for me was...

candy, or more specifically those sour gummy worms. Viewing the two columns as the two halves of the worms checks out; some were red/yellow, some were orange/green, and some were pink/blue.

Unfortunately, I'm not sure of the missing color because...

the gummy worms I had growing up only came in those three color combinations! I'm struggling to think of any candy that included that shade of light blue.

Maybe someone else will be able to get the correct color from here.


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