So, you want "Solid As Metal"? And to hype you up even more... the OFFICIAL FILE to Solid As Metal?

You're going to have to find for it. No hints, you must be extremely observant.

The mod resides outside "The Exit". To go to different stages, decode the texts below. Then use "sites.google.com/view/puzzle-stage/ + your decoded text" to do so. Right now, this is Stage 0.