Do you want the game to acknowledge when youve entered a room to make sure they enter all of the rooms?
In that case just do a true false variable for each room like Lordirish showed.
Do you want the ability to just walk around the house freely but for the player to only walk from one room to an adjacent (no going into the attic from the front door)?
In this case just do a *gosub for each room which returns to either the upstairs or downstairs hallway.
I had rooms you could enter in my little minigame “Hide and Seek” if you want to see the code for that (although its a little bulky)
Link here: (Hide and Seek (updated 10/12) (WIP))