Fantastic work there! Thanks for doing it so we don't have to
One thing bothers me for some time. During beta wasn't the playable area smaller? I've been playing since day one but not the beta times.
If the mystery was finalised during gamma but it's discoverable since beta than...so wasn't the space limited?
Finalised in gamma does not mean it was solveable. But in your glossary I saw it was discoverable during beta. I saw that statement before and was looking for it for some time but didn't find the actual statement yet.
I as far as I remember the space was limited at the start of standard beta, but it became infinite during standard beta.