One thing to note, in no level does it require the visitor to close any more than 3 fire doors; it is possible to make do with only 3, meaning that this type of everyone survives timeline can happen with only three travellers, fascinating, isn't it?
Wait a minute, what happens to the iterations of the visitor that was was with Steve or Christina as the final survivor? The visitor traveled back with Lionel in his timeline and decided not to go in Troy's. So what happened to those iterations?
 "Fear Less!"){kind=icon}
 "Zombo Buster Rising"){kind=icon}
 "League of Angels"){kind=icon}
 "Robot Dinosaurs That Shoot Beams When They Roar"){kind=icon}
 "no-one has to die."){kind=icon}
 "Give Up"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "Siegius"){kind=icon}
 "Loved"){kind=icon}
 "The Grinns Tale"){kind=icon}
 "Relic Of War"){kind=icon}
 "Caravaneer"){kind=icon}
 "Coinbox Hero"){kind=icon}
 "Adventure Story"){kind=icon}
 "Thousand Dollar Soul"){kind=icon}