What about cameras in front of the Arthur’s eyes that feed the video to the John in another room wearing a vr headset?
Dumb idea: escape room, Malevolent-style.
The puzzles are built for two people; one person is blindfolded, the other isn't allowed to touch anything. Non-blindfolded one has to tell blindfolded one what they see and what to do next.
Bonus points if some Eldritch Nonsense is introduced every so often via holograms, sound effects, animatronics, etc.