A puzzle campaign where players (3 is probably best for this) come across this door, which each person sees differently and as they all look at this door they see it change based on time (gets older for future and newer for past) and it messes with their senses (sight hearing and touch) where depending on what sense they lose and what they saw explains their special ability (if they saw the door got newer and they lost their sense of touch they’d be able to touch things of the past) and using these ablities to solve puzzles and save the world. (when with three people you can also use parallel universes)