( I don't know if it's spoiler or nah, but to avoid spoiling unfortunates souls here, I'm still gonna place this under the spoiler thing )
Note : I'll give off two timelines
- [+] spoiler
( Connect all games ) : BC ( 'Loop' Wrong End ) > BoS ( Chapters inside HH without [Mire] and [Tooth] ) > 2U ( Except EX CHAP which take place during BoS ) > BD
( Good Endings ) : BC ( Good end ) > Chapter 8 of BoS [ Blood Drive ] > BD
Note : For the 1st timeline, when they say they remember things from another game or something, it may come from their memories that may have forgotten things because of the loops and remembers them upon seeing or hearing what trigger this ( Exemple : Looking at the dead body of a person you already met alive in another game )
For the 2nd timeline, we can assume they remember things from alternates universes or timelines.