Board Thread:General Discussion/@comment-35196587-20181001142351/@comment-32384228-20181016145527

5sides wrote: Players have been calling them keys for years. It was only in 2017 that some players came here and referred to them as "room passes". Another odditiy is that the Wiki is being updated and "rooms" or "locations" are being called "pictures". Why is that? We don't play a Picture. We play a room if it is inside or we play a location if it is outside. Puzzles still seem to retain their name...

I think the change in name came after new players joined the game. MT in the single line instruction which pops on screen calls them passes. Therefore new players picked up the new name.