Check other games in the wretched weekend, found two codes so far:
BEHOLD: aHR0cHM6Ly
The Graveyard Shift: nL3dpa2kvU2
Possible third in Frontier Diver: 9TYXR1cm4=
Vestigial: aHR0cHM6Ly, but that's just the http:/ again.
Ashimeyama: aHR0cHM6Ly again.
Help from PedroStormrage in r/ARG:
Oh, good job! If you concatenate the last two codes superimposing the matching characters (U2VnYV9TYXR1cm4=) and then decode it using base 64, you get Sega_Saturn (which was the only I could think of after seeing "Sega_S" being the meaning of the second code)! I'm still not sure how that's meaningful, though.
I also tried to concatenate the first code (nL3dpa2kvU2) to the others in the same fashion (nL3dpa2kvU2VnYV9TYXR1cm4=), but didn't get anything meaningful out of it.
If you remove the first n from nL3dpa2kvU2VnYV9TYXR1cm4=, you get /wiki/Sega_Saturn.
Alright, I found this
in Smalls Island Woes, but those letters do nothing in imgur.
There's also one from A Structure of Unknown Origin at Little Pine State Park: aWtpcGVkaW
, which is ikipedi in Base64.
So maybe it's https://en.wikipedia.org/wiki/Sega_Saturn, but I haven't found a code that for sure says it's the English version. No Players Online's dev apparently hid a real note in the woods in Belgium. Gonna keep looking.
Update: No big code piece in Smalls Island Woes.
