This is part of The Twenty Doors series.
The next one is The Twenty Doors! (ROOM 2)

You stand in a small, dark room. You have no idea where you are. Then, you see a message in front of you.

Welcome to the dungeon!

In each room, there is some paper, a hint, a door and a keypad. You must decipher the paper, using the hint, and enter what you think the answer is into the keypad. But don't answer wrong, or you will DIE!!!

Have fun, if you can...

  • Dr. X


You look at the paper:


Then, you see that the hint is carved into the wall: Hello, over and over. The keypad has 9 numbers and an [ENTER] button.

  • 4
    $\begingroup$ You might want to change the title if there are going to be 19 more of these. Perhaps "The first of twenty doors!" $\endgroup$ Commented Jun 30, 2015 at 14:31
  • 2
    $\begingroup$ It seems that there are 2 answers, both that seem viable..But which one is correct? I suggest that you double check the future puzzles (if there are to be 20) that there is only 1 unique answer otherwise they might be considered as "too broad" or possibly "opinion based". [Which can result in a closed question] $\endgroup$
    – Mark N
    Commented Jun 30, 2015 at 14:56
  • 5
    $\begingroup$ I suggest you break this puzzle into separate questions (either now or after the 2nd part) as the question and the amount of answers provided will become very large (very quickly) if you keep building on top of it. It will also become harder to understand the flow of answers and who should be credited. You can always reference back to this question in your future ones with a link. (Especially if the only thing carried forward is the story). You could also mention if the previous questions answer could be important or not. $\endgroup$
    – Mark N
    Commented Jun 30, 2015 at 17:51
  • $\begingroup$ @MarkN Good idea. I will do it now. $\endgroup$
    – user9377
    Commented Jun 30, 2015 at 19:00
  • $\begingroup$ so what are the nine numbers?... :) ... 0, 44, 35, 99999, 23457, 6, 42, 49, and 1234567890 $\endgroup$ Commented Jun 30, 2015 at 20:44

3 Answers 3


Room 1:

The code is 14, if we decipher uipefvyq with the Vigenere cipher 'hello', we get neetruof, which is fourteen backwards.

I hope I won't DIE...

  • $\begingroup$ I actually used a one-time pad with the key HelloHello, but this works! $\endgroup$
    – user9377
    Commented Jun 30, 2015 at 17:02
  • 4
    $\begingroup$ @Kslkgh, The difference between Vigenere and OTP is that in Vigenere the key repeats. $\endgroup$
    – hildred
    Commented Jun 30, 2015 at 21:42
  • $\begingroup$ @hildred Yeah, I misused the OTP cipher a bit. But only realised once I was coming back from work, and didn't want to change the key that some people were cracking. $\endgroup$
    – user9377
    Commented Jul 1, 2015 at 6:43

Credit to Cerberus for decoding the message. However, I think the conclusion in that answer is wrong. I think it should be



it's 14 backwards

  • $\begingroup$ I did actually do fourteen, but this is still a good answer. $\endgroup$
    – user9377
    Commented Jun 30, 2015 at 17:31
  • $\begingroup$ That actually a clever observation +1 $\endgroup$
    – DarthRubik
    Commented Aug 3, 2016 at 2:32

Credit to both asdfffff and Cerberus, but I think that both of you were part of the way there.

Cerberus pointing out that:

Decrypting uipefvyq gives you neetruof

and asdfffff pointing out

41 would be fourteen backwards!

But you skipped the last part of the hint!

I think the answer would be:



It is 41 over and over.

  • $\begingroup$ you may need to double the length as that is only a single repeat, and doubling matches the length of the hint. $\endgroup$
    – hildred
    Commented Jun 30, 2015 at 17:22
  • 2
    $\begingroup$ The 'over and over' part was referencing the use the Vigenere cipher with 'hello', however your answer does seem to be possible as well. $\endgroup$
    – Mark N
    Commented Jun 30, 2015 at 17:39
  • 3
    $\begingroup$ It might as well be 41411414, which is 41 over and over AND 14 over and over. But if we're going to do that, just make it 4141141441411414, which is 41411414 over and over... $\endgroup$
    – Deacon
    Commented Jun 30, 2015 at 17:57
  • $\begingroup$ @MarkN Yeah, I misused the OTP cipher. $\endgroup$
    – user9377
    Commented Jul 1, 2015 at 5:56

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