Chris’s shack appears to be mostly useless with regards to this particular set of clues. Did anyone find anything useful there besides tacos? Also can we compile a list of all extensions and the names attached to them on the OP?
“bm_c2a4d.bsp” does not exist. the maps go “bm_c2a4c.bsp” and skip to “bm_c2a4e.bsp”.
Sure, I’m about to go to bed now, but if you want to get something together I’ll gladly add it to the OP when I wake up. I’ve also been meaning to list all the secret rooms so far.
Here’s two EXTs to get started:
Dr. J. D. Marcel - 1187.463
Anomalous Materials - 01433
Strange, what part of the story is that? Maybe something got cut out in between?
I’m gonna call it a day, too. the map should fall somewhere in QE. It might have been the upper level including parts of LAB C.
BTW the maps in QE appear to mislable lab C as lab D and lab D as Lab B. I’ll verify later on.
Another thought regarding the large number puzzle.
In QE where you find the two dead scientists behind the worktop with the pizza on it, there are a set of 3 tables at the back of that room. Above each table theres a plaque or picture of something resembling this:
https://en.wikipedia.org/wiki/Grille_(cryptography)
Gonna have a poke at trying to see if they’re relevent. Screenshots of the plaques are in this album.
Hope it helps ^^
EDIT: Was completely Irrelevant to the number puzzle. Is now SOLVED. See below.
Another code for you guys, solved them.
The 3 grilles over lay on each other and form a 4 digit code.
CODE B: 0851 (assuming its code B ) ^^
Yay helping! 
Brilliant!
Gotta admit, I wouldn’t have thought to do that. Good job. But for real, if the message is what was said above, i’m going to punch Stormseeker in the kidneys.
Nice find!
Okay, I have a ton of time during and between classes today, so I’m gonna try to solve that nihilist cipher right now, using ‘pizza’ as both key phrases. Nobody else solve it before me!
Edit: Failure. Mixed alphabet with ‘pizza’ does not work. Next up is a standard alphabet.
Edit 2: https://en.wikipedia.org/wiki/Intel_Cascade_Cipher
I found our ‘cascade’ cipher, but it has 128 bit keys and blocks. Also I have no idea how to use it.
Yessir mr pyro sir, hope you have more luck than i have had so far. I’ve got my cpu crunching numbers over all sorts of ciphers but nothing has come of it yet.
I’m getting the feeling that the white board in the Gman room of QE is more important than we think. The cascade cipher pretty much means its encoded more than once (or at least thats my understanding), maybe look into the lists of cipher types that are listed?
I was reading up on that yesterday, and according to that page, you need a license to even use it (however reliable that page is), so I don’t think they’d be using it. But that’s assuming that is the only “Cascade” cipher. But I could be wrong because that whiteboard did say something about a Cascade cipher. Maybe the devs are trying to fuck with us and make us use the wrong one? lol. Cool name for a cipher though.
Okay, so a standard polybius square with ‘pizza’ as the keyword doesn’t work either, the first number it gave me was a negative. All things considered, I think that we might have to rule out the nihilist cipher for now.
Plus, given the codes that we have solved so far, it may very well be something much simpler.
Edit: Okay, yeah, almost definitely not a nihilist cipher. Some frequency analysis shows hugely more variance in our numbers than in the sample cipher from wikipedia.
Edit 2: for future reference, here’s that code w/o slashes: 24 51 95 98 85 82 25 98 68 84 54 35 84 35 99 64 35 65 67 94 62
Edit 3: You know, the sum total is 1404. We should try using that with the other code someone got from the code grilles just to see.
So, this means that a possibly complete code is…
1001085139141404
Or
1001
0851
3914
1404
Edit: Whoever solved the code grilles, was there anything in that area that would indicate it to be code B or code D? Like, there’s a message directing Dr. Horn to the canteen, does that have any numbers associated with it? I’d check myself but I can’t play BM ATM.
Nothing that I could see, i’ll head back in now though and have another good look at it 
EDIT: Nope, nothing. Although i’d bet on it being Code B. Its after code A, and well before the hidden radio room which contained code C.
Wow, there are 53 people reading this thread.
…I feel like I’m being judged.
No pressure here, you guys are doing great!
Sadly I’m too busy to join the scavenger hunt right now, but the progress I see you all make is quite thrilling. I wonder where this is leading…
Who knows. I’m starting to suspect that I have no idea what I’m doing
Edit: Hm, who merged the posts?
Has anyone looked at the pizza itself? I remember in the Portal ARG someone decomplied the texture or looked at it’s material properties and some things were hidden in them. Also right before you save the scientists the room you drop into with the 3 furnaces I forgot to noclip into the first 2 to see if there was anything in it but has anyone tried putting the pizza in it then cut it with the surgical machine?
Just spawn the pizza inside of the secret rooms
Head is aching at this number puzzle now. Noclipping around QE for a bit, see if i can find anything new 
Have fun! I’ll just be here, waiting for news, and not playing Black Mesa. :’(
Well yes, grups of five digits are common in modern cryptology, they are what I called exotic cyphers. It seems around the 80s or 90s the military/government switched from the old style cyphers to a more exotic style and in all honesty the new styles are no harder to crack than the old ones.
As I stated earlier I have this one Enigma cypher Ive been trying to crack for the past 7 years and some people with a super computer had a super computer working 24/7 for 2 years and couldnt crack what the message said. To this date the M4 Enigma cypher machine cranks out codes that are almost impossible to decode unless you have atleast one piece of the Enigma settings to play around with. But even with one setting, say if I have the plug board setting I still have easily 5,000,000 combinations for the 10 rotors and the 26 different settings each rotor can be installed at. The rotor starting position and the cypher key is encoded into the message. But since I dont have the plug board setting I just have to go through different settings unless I can find a snipet of the M4 setting for that exact date in 1944 which is pretty much impossible considering typically the settings document for the day were destoryed at the end of the day.
For this though I dont know, it could be a traditional military style cypher which would fit in considering the military was still using the old style cyphers for the most part when HL1 came out in 1998. But since we are not dealing with military personel writing these cyphers out then it would have to be a cypher that a scientist would use. I have played around with some modern day cyphers but not enough to be well versed in them but if this is in deed an older cypher then I could help if this is done in the correct style. In a traditional Enigma cypher for instance you dont use characters such as spaces or periods. But for some reason I just dont think there was anyone in the group creating the game that knows the correct way to present the older cyphers.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.