D&D 5E (2014) How to Build an Interesting "Mouse Puzzle Maze" Challenge?

[PoleVolt]

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 party looks down upon them and tries to guide/help them through from other vantage points. To the end for that sweet cheese (in reality, a giant expensive gem). All the while on a time limit as poisonous gas fills the maze slowly killing the Fighter each round.

I know I want different obstacles to impede/slow them. Like blockages that will need to be cleared, dead ends, traps to avoid or be disabled and monster encounters. As for the Fighter, all close quarter. The remaining party, all ranged. However what they could be, frequency or deadliness I have no clue. Much like how much damage could be from the poisonous gas.

To end the maze prematurely. The remaining party could perhaps find a way into a control centre shutting it all off. Alas, this direction would defeat the whole purpose of the maze.

Any suggestions to help would be much appreciated. Or pointing me in any direction of some rules that can help me structure this challenge.

Thanks in advance

 

[lycanthropejeff]

Matt Colville's video on skill challenges that might give you some ideas on how to get those characters not actually in the maze a good mechanic for participating.

 

[CreamCloud0]

i'd say remember to account for attempting, and provide 'official' avenues for party assistance, but be clear (in universe) that both of these exist, don't let them just dimension door the fighter out or something(maybe the fighter gets harmed as punishment for 'cheating'), the maze has to be cleared on it's own terms or by finding the shutoff

if the party can provide 'official' boons to the fighter by completing their own puzzles this provides a decision point between trying to assist the fighter by completing their own challenges, leaving the fighter to fend for themselves in the maze while trying find the control room themselves or splitting their forces between those two solutions.

 

[Koloth]

Watch out for the save or die/fall unconscious/etc type traps. If the fighter goes down, probably end of challenge.
Similar for critters with interesting abilities.
Can the observing party members participate remotely? Cast helpful spells or shoot opposing critters?
Does the fighter have any meaningful trap finding/removing ability? A trap heavy maze with no ability to detect and remove will most likely end with a terminal splat.
Can maze critters target those pesky observers? Seems fair if the observers can target the critters.
Allowing direct interaction between the observers and maze critters could really mess with balance.