I haven't seen anyone talk about Interlude in a while, which in my opinion, is the most promising mod that's currently relevant. There's been a bunch of ARGs posted on the youtube channel for it, with them needing decoding. Can anyone figure this out? youtube.com/watch?v=l6NuZuGBUg0
Sounds like a spectogram (litteraly portal ARG moves). Somebody gotta put it into a sound program