Not too long ago, while I was hanging around in a sports club playing darts, I met a friend. We talked for a while. When he suddenly came up with an idea of a puzzle. He grabbed a piece of paper and noted down something which looked like a cipher. He stood up and asked me to meet once I decipher the note. I asked him "But you didn't tell the place to meet?". He just smiled and said "Eye the bull's eye" and took off.

The note looked like this -

Fl itl kotbr epu verlyos.

Can you help crack it?

  • 2
    $\begingroup$ Aargh! I was trying out stuff with the thing you've just clarified. rot13(Gur gvgyr naq gur zrffntr yratgu znqr vg boivbhf rabhtu, va zl bcvavba.) $\endgroup$
    – M Oehm
    Mar 16, 2017 at 18:21
  • $\begingroup$ @M Oehm I thought it didn't got much attention and hence thought I made it ambiguous. :) $\endgroup$
    – Techidiot
    Mar 16, 2017 at 18:24
  • $\begingroup$ Well, for all my trying out I haven't gone anywhere so far, so maybe it wasn't that big a giveaway. $\endgroup$
    – M Oehm
    Mar 16, 2017 at 18:26
  • $\begingroup$ @M Oehm Okay cool. All the best :) $\endgroup$
    – Techidiot
    Mar 16, 2017 at 18:36

1 Answer 1


Your friend wants to meet at ...


Here's why -

Dartboards have scores ranging 1-20 around the outside; clockwise from top-center, the scores are 20 1 18 4 13 6 10 15 2 17 3 19 7 16 8 11 14 9 12 5

Wrapping the message around the dartboard, starting from the "1" which seems a sensible starting point, the letters map thus:
1=F, 18=L, 4=I, 13=T, 6=L, 10=K, 15=O, 2=T, 17=B, 3=R,
19=E, 7=P, 16=U, 8=V, 11=E, 14=R, 9=L, 12=Y, 5=O, 20=S

Now sorting those numerically, you get this:
1=F, 2=T, 3=R, 4=I, 5=O, 6=L, 7=P, 8=V, 9=L, 10=K,
11=E, 12=Y, 13=T, 14=R, 15=O, 16=U, 17=B, 18=L, 19=E, 20=S

Decrypting "FTRIOLPVL" with Vigenére key "TROUBLES" gives:

Go get your burger on. Have a Shamrock Shake for me!

  • $\begingroup$ A free Shamrock Shake is on the way! :) $\endgroup$
    – Techidiot
    Mar 17, 2017 at 7:31

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