You sit in front of a computer terminal. To save a puppy from beeing eaten by a unicorn (I'll make up a better background next time) you need to enter the correct password of 4 letters. You are given a hint:

4:6 2:1 3:0 3:0 3:3 3:7 3:2 3:4 : 4:8 4:4 3:1 1:0
P   A   S   S   W   O   R   D   :

What is the Password?


Neither my son nor my father could solve this, unless they worked together.

  • 2
    $\begingroup$ I must say, very insecure password ;) $\endgroup$ Oct 20, 2016 at 15:19
  • 1
    $\begingroup$ @me_digvijay Unicorns are quite trusting I guess. :) $\endgroup$ Oct 20, 2016 at 15:21
  • 1
    $\begingroup$ I presume the clue is that 4:6 equates to P, etc. That would mean the password we seek is four characters. $\endgroup$ Oct 20, 2016 at 18:31
  • $\begingroup$ @EngineerToast: Confirmed. $\endgroup$ Oct 21, 2016 at 8:28
  • 1
    $\begingroup$ @lois6b: Would be coincidence, as I created this puzzle right for this post. $\endgroup$ Oct 21, 2016 at 8:52

1 Answer 1


I think the answer is



The code is a mix between morse code and binary, so a number pair A:B tells you that the letter has A characters in its morse code representation and if we translate that representation to binary (with dashes as 1s and dots as 0s), we get B.


The first number is 4:6, this means we have four morse code characters which in binary represents 6, i.e, 0110 = .--. = P.

The others are
4:8 $\rightarrow$ 1000 $\rightarrow$ -... $\rightarrow$ B
4:4 $\rightarrow$ 0100 $\rightarrow$ .-.. $\rightarrow$ L
3:1 $\rightarrow$ 001 $\rightarrow$ ..- $\rightarrow$ U
1:0 $\rightarrow$ 0 $\rightarrow$ . $\rightarrow$ E

  • $\begingroup$ and about the clue? $\endgroup$
    – lois6b
    Oct 21, 2016 at 9:55
  • 1
    $\begingroup$ @lois6b morse code is something his father would know (fairly old technique). binary is something his son would know (fairly recent technique) $\endgroup$
    – nl-x
    Oct 21, 2016 at 9:56
  • 1
    $\begingroup$ Looks like a great answer! Pity if there were really a typo in the question though, as its a pretty good puzzle too. $\endgroup$
    – Xenocacia
    Oct 21, 2016 at 10:03
  • 1
    $\begingroup$ Unfortunately the 0:0 was indeed a typo. Can't say how much this annoys me. :/ $\endgroup$ Oct 21, 2016 at 10:05
  • 1
    $\begingroup$ I was trying to figure out why the first number was even necessary and then I realized it was to tell you how many leading zeros you need. $\endgroup$ Oct 21, 2016 at 11:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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