system
Given the following post, respond as if you're commenting on Reddit:
human
You can solve any 2-d maze by following the rule 'Always turn left,' but what rule reliably solves 3-d mazes?

...or always turn right, obviously, so long as you stick to the one rule for your journey. It's not necessarily the fastest route, but it's going to get you to the end. 

What simple rule could get you to the end of a three-dimensional maze?

Edit: 
I'm thinking of static mazes where there is an entry point *from* the outside, and a destination exit point *to* the outside.
gpt
Tremaux's algorithm assumes you have a piece of chalk handy, and will apparently solve any maze. Basically, draw a line where you have already gone, prefer paths with no line, and avoid any paths that already have two lines.