As you continue down the corridor, you come across a door and panel, clearly left untouched for many years. Hoping to get lucky, you try the door but it is locked. On the panel is a line of 6 buttons, colored RED, ORANGE, YELLOW, GREEN, BLUE, and PURPLE. As you search, you notice writing in the dust. You can faintly make out what appears to be:

       CR N
       PL F

How do you proceed?

  • $\begingroup$ Are we certain that this is pertinent to the "cipher" tag? Regardless, a nice little puzzle. $\endgroup$ Commented Feb 23, 2017 at 10:30
  • $\begingroup$ @can-ned_food I see what you mean. If you know of a better tag, I'll switch it. $\endgroup$ Commented Feb 23, 2017 at 15:05

2 Answers 2


Making this community wiki so maybe someone else can take it from here:

The dust appears to contain the color names except for YELLOW, it contains BLUE twice, and I'm not sure what the word preceding the colon is. "PRESS" perhaps?

enter image description here

CreatedByBrett got the final bit:

enter image description here


Beastly Gerbil's answer covered everything except the meaning of the characters on the left. I think I got that and can answer the question.

The characters in the dust are instructions to follow. Some parts of the letters have been smudged out. Filling them in, we get: https://i.sstatic.net/QvCRH.png

  • 2
    $\begingroup$ Wasn't my answer $\endgroup$ Commented Feb 22, 2017 at 20:48
  • 1
    $\begingroup$ Oh, I hadn't seen "community wiki" before, and I saw your name, so I figured it was yours. Looks like it was ... Tilper! $\endgroup$ Commented Feb 22, 2017 at 21:13
  • $\begingroup$ @BrettFromLA, indeed, 'twas I! Stack Exchange could definitely slightly improve the author indication for community wikis, but oh well. $\endgroup$
    – user33097
    Commented Feb 23, 2017 at 0:36
  • $\begingroup$ @BeastlyGerbil, thanks, was struggling to get that image to stay hidden then had to give up because break time was over. Sigh. $\endgroup$
    – user33097
    Commented Feb 23, 2017 at 0:37
  • 1
    $\begingroup$ @tilper Limited break times, the bane of creativity. $\endgroup$ Commented Feb 23, 2017 at 17:58

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