Having the maze change up sounds interesting. Keeps everyone on their toes. Or if I feel it's going a bit too easy half way through.
Could have fallen ghost maze runners chase The Fighter and latch onto them until the cleric casts Turn Undead a couple times.
Yeah. I'd like to have something every member can do. Or split up into smaller onlooking teams. Which needs to be in different places to, say hold levers. To slow the gas as in your example.
The onlooking party could throw potions or buffs that don't require touch throughout the maze's...
Definitely I want the onlooking party to participate remotely from the maze. Hitting targets to raise doors or light the way through arrows with the Light spell cast on them. Or just simply things the Fighter won't be able to reach. Like a flying creature that has a key wrapped around its leg...
The maze will have safeguards in place for blatant cheating like dimension door or other-like spells. Although I do want the "roof" of the maze open for the onlooking party to see down upon. Firstly covered by an ever present "darkness" spell or some other hindering mist. Perhaps only after some...
Structuring it with skill challenges could work. I think with how I want it to feel, that would fit quite well. More flashy and cinematic-like. Treating the build up in a similar way of saved or failed death saving throws naturally adds a bit of tension to each roll.
Struggling to think or piece together this type of scenario. I can't really say any official published adventure has covered this specific type of challenge in my looking.
It's my goal to have a single 12th-Level Fighter with base 148 HPs enter this "mouse puzzle maze". While the remaining...