Thanks for the advices...
My game Is Just a experiment, I think the game Will have 60 rooms.
I think are 60 objects Isn't a huge problem for the ram, but I have a doubt: how many groups can save .INI?
The my idea Is make a actvice object with variable A on 1 when character visit that room, so I add condizioni reapear image in start frame. Very Easy... But I Hope that not causing problems with INI or RAM