Suggested by Athin, try & make another feasible puzzle for this series. Enjoy :D
The prologue also be revised more precisely.

This puzzle will provide several images. These images compose a sequence with several grouping properties by the same objective feature, and one of them also makes the images get ordered additionally.
Please try to identify what properties contained by this sequence, and answer the missing one.

The answer should include an image, and a few reasons to illustrate why you pick the image. Note that the answer may not be unique, but I'll try my best for the uniqueness.


enter image description here $\to$ enter image description here $\to$ enter image description here $\to$ enter image description here $\to$ enter image description here $\to$ $(?)$

  • $\begingroup$ @Athin Hope this puzzle is better, wanna try to solve it? :D $\endgroup$
    – Conifers
    Oct 2 '19 at 12:51
  • 1
    $\begingroup$ FYI as I haven't commented or answered here so I didn't get pinged when you mentioned me ^^, but anyway yeah this feels much better, I haven't successfully solved it yet tho XD $\endgroup$
    – athin
    Oct 2 '19 at 14:45

The next flag in the sequence is:

enter image description here
The flag of SOUTH KOREA.

Why? For starters, note that the other flags belong to:

These are all countries in Asia. We are therefore looking for another country in Asia.


Count the number of blocks of colour in each flag:
Bahrain = 2 (1 red, 1 white)
Maldives = 3 (1 green, 1 red, 1 white)
Jordan = 5 (1 black, 1 green, 1 red, 2 white)
Singapore = 8 (1 red, 7 white)
Israel = 13 (3 blue, 10 white)

These derived numbers are:

Subsequent terms (after the initial two 1's) in the Fibonacci sequence.

For the next term in the sequence, we are therefore looking for:

A flag of an Asian country which is built up of 21 separate blocks of colour.

The South Korean flag satisfies this criterion (18 black, 1 blue, 1 red, 1 white).

  • $\begingroup$ Ubj qb lbh pbhag gra oybpxf bs juvgr pbybhe va gur Vfenryv synt? V frr fvk oybpxf va gur cbvagf bs gur fgne, bar oybpx va gur zvqqyr naq bar oybpx nebhaq gur fgne. V bayl znantr gb trg gb rvtug. $\endgroup$
    – jarnbjo
    Oct 2 '19 at 16:42
  • $\begingroup$ @jarnbjo The white is particularly hard to see against the background, I admit. But: rot13(gurer vf bar juvgr one ng gur gbc naq nabgure ng gur obggbz, nobir naq orybj gur oyhr fgevcf) :) See here $\endgroup$
    – Stiv
    Oct 2 '19 at 16:44
  • $\begingroup$ Nu, bx. V gubhtug gur oyhr fgevcrf jrer qverpgyl ba gur rqtr bs gur synt. $\endgroup$
    – jarnbjo
    Oct 2 '19 at 16:45
  • 1
    $\begingroup$ @Stiv, You got it~ great observation :) $\endgroup$
    – Conifers
    Oct 3 '19 at 1:25

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