# Issues with Graph-It (Geometry Homework)

You are working on your geometry homework (graphic quadratics) and become bored of drawing the axes over and over again. Instead, you find an online tool called Graph-It that you use to graph the quadratics easily. For the first couple graphs, it worked fine... but then, you started to get an error message rather than a graph:

GRAPH CANNOT BE DISPLAYED! Error code: MEL#NBHPBNTMGL#LNCTKHOLEW#RZNY

You try many times, but still get the same message.

Frustrated, you go onto an online forum where haters of the Graph-It application can vent their frustration (it's creatively named Die, Graph-It):

geo_luver_122: this is dumb i keep getting this error code --> G##MEDCZXKCBUMXODUQJKCBFLCNFBNEYCPQHGQTNLW

pandabear55: @geo_luver_122 Me 2! IDK why! Sometimes i get this error also --> GU#LNCRBNWTGJZAPHOLJHBEZONOIPKEQUOJOIGUPAJOZEYHZ

geniusman5000: @geo_luver_122 @pandabear55 lol u guys r noobz theres a good reason u cant access those graphs

geniusman5000: @geo_luver_122 @pandabear55 btw imma tell ur teachers lol



What's the deal with Graph-It? When can you not access the graphs? What will geniusman5000 tell pandabear55's and geo_luver_122's teachers?

### Hints

Hint 1:

The error messages are the most relevant piece of the puzzle!

Hint 2:

Look at them tags!

• imagine if this actually happened to you – matt Sep 28 '20 at 20:14
• @matt -- That would be unfortunate! – Voldemort's Wrath Sep 28 '20 at 20:31
• i'd imagine so :p – matt Sep 28 '20 at 21:34
• The only reason I got this puzzle was by looking through a list of ciphers, because I knew you had made puzzles that were very similar to this before. "Guess the cipher" puzzles generally aren't very interesting, and if you don't know that the cipher already exists there's nothing really pointing towards them. (The point of ciphers is not to be cracked!) – Deusovi Sep 29 '20 at 19:30
• Is wordplay really appropriate here? I suppose ciphers would be too obvious, but wordplay... – Quintec Sep 30 '20 at 0:46

This appears to be

messages encoded with the "Digrafid cipher", which is a thing I had never heard of before.
They decode to:
DONOTCHEATONYOURMATHHOMEWORK##
YOUARELITERALLYINTHEMIDDLEOFANEXAMRIGHTNOW
YOURPARENTSHAVEGROUNDEDYOUNOELECTRONICSALLOWED##

What's the deal with Graph-It?
When can you not access the graphs?
What will geniusman5000 tell pandabear55's and geo_luver_122's teachers?

It looks like you can't graph things from specific homework assignments or exams, and geniusman5000 will tell the teachers of the other two that they were cheating.

• To be fair, the name of the Chat Room does point you ever so slightly towards the name of the cipher, although kudos to you — I’d never have gotten that far. – El-Guest Sep 29 '20 at 19:36
• @el-guest Yeah, but the only way I would've known that it was that in particular is if I already knew how the puzzle worked. Without knowing that I should be digging through lists of ciphers from OP's precious puzzles, I would have no way to figure out which specific phrase I should corrupt in what specific way, to find the search terms I actually need. – Deusovi Sep 29 '20 at 19:43
• agreed — I’m saying all this in hindsight, but as I mentioned I couldn’t have worked my way forward to arrive at this answer myself. – El-Guest Sep 29 '20 at 19:45
• What do you mean by "precious puzzles?" – Voldemort's Wrath Sep 29 '20 at 20:58
• @Voldemort'sWrath Meant "previous" - typo, sorry! – Deusovi Sep 29 '20 at 22:48