Find the missing letter in this puzzle.
Which letter will come at first place?

enter image description here

  • 1
    $\begingroup$ possible duplicate of What comes next in this sequence? $\endgroup$ – Len May 8 '15 at 4:31
  • 2
    $\begingroup$ @Len This one is arguably better since it's a larger sample size with a graphic. For the other post, you could find for example a famous quote starting with those letters. I don't really know what goes into deciding which should be the main one so I ended up just answering instead of voting to close. $\endgroup$ – Quark May 8 '15 at 4:35
  • $\begingroup$ @Quark - For the other post, I am going by the OP's intent which is the same sequence. Usually the second post is called the duplicate unless it is perhaps much better but I do not know of such an example. There are differing perspectives on exactly what is a duplicate and the decision requires 5 votes. You are welcome to cast your vote by visiting the review queue. $\endgroup$ – Len May 8 '15 at 5:06
  • 2
    $\begingroup$ The answer to both are the same, but that is known only after solving the puzzle. The Presentation looks Sufficiently Different. Hence marking as "Not Duplicate". ((Not all puzzles whose core is the same can be marked as Duplicates)) $\endgroup$ – Prem May 8 '15 at 7:56
  • 1
    $\begingroup$ The different thicknesses of the lines are an unintended red herring. $\endgroup$ – xnor May 8 '15 at 18:35

The answer is:

O, the boxes represent the first letters of "one, two, three, four, five, six" etc.


I think the other answers about it being:


are correct, but at the same time there is zero context for the puzzle. You're just asking me to spot a pattern. As such, I propose that the answer could just as easily be:



-Treat each column as an individual vertical sequence
-The letters of each column repeat vertically
-E.g. from right-most column to left-most column, bottom to top:

My alternative answer is:


  • 1
    $\begingroup$ This looks valid to me, I had spotted this pattern before checking the other answers. $\endgroup$ – AJFaraday May 8 '15 at 14:30
  • $\begingroup$ I wonder if any patterns like this can be found in the first letters of numbers further up the scale... $\endgroup$ – AJFaraday May 8 '15 at 14:30
  • $\begingroup$ Definitely a good point. (And I never noticed that repeating pattern before in the first twenty numbers) I wonder if my answer could really be considered the correct one. $\endgroup$ – Quark May 8 '15 at 16:02
  • $\begingroup$ +1, correct answer is 0 , alternative answer is just to confuse with similar pattern. $\endgroup$ – Himanshu May 8 '15 at 17:01
  • $\begingroup$ @himanshu define "correct". Any answer that follows a pattern is correct. Just because it's not the answer the asker had in mind doesn't make it less correct. $\endgroup$ – theyetiman May 9 '15 at 9:36

O (denoting One)

Others in the puzzle

O(1) T(2) T(3) F(4) F(5) S(6) S(7) E(8) N(9) T(10) E(11) T(12) T(13) F(14) F(15) S(16) S(17) E(18) N(19) T(20)


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.