You could consider using a room role, maybe?
Like if the player finishes the intro, they get a role for it. When a player joins the room and they have the role, they automatically are teleported to the next subroom.
#Subroom spawn point change
prisma escarp
sonic sentinel
You need to use a cloud variable, when you join the room it set the variable to a number and the next Time it check if variable is 1, first subroom, if 2, second subroom ect...
And in the lobby you Can set to 0 to erase your save
sonic sentinel
Thé rôles are not in cloud, but now im in school
sonic sentinel
I Can Do a picture of what you need to do in 3 hours if you want
sonic sentinel
you need to do this in the lobby, it checks the player save.
and after at each room you need to rearange this circuit for each room you enter, it checks if the player as already a higher save, and if its false it adds a point to the save, else it let you in the room (if you do the map with multiple people)
if you want i can install it for you you just need to DM me and you can have my rr name in my bio