Things we have tried:
- Clipping off of the grave in the D1 map to find an entrance to Luna Tower (it doesn't exist)
- Progressing all reasonable flags in Belinsk (e.g. Arangora prelude) to see if that does anything (it doesn't)
- Dying to the Crystallux encounter
- Attempting to trigger the Crystallux encounter repeatedly (it only triggers if the +0x80 bit isn't set)
- Slapping Eoleo's cage THEN getting Crystallux; this actually works, but still requires is some way to access the D2 map for the slap!
- Triggering all cutsceenes inside of Belinsk Castle from the D1 map and D2 map with Crystallux flag set
- Clipping off of the right lamp post in South Belinsk near the opera house and trying to find a door to D2 (it doesn't exist, since it loads based on flags)