A couple days ago Tom and I gave the default maze you get given a shot. He was 5 levels higher than me so the mobs were all killable with just the two of us. It took a while to win and I think we were close to running out of time but we managed to get it done. But it seems 2 people probably can't level synch together to win so we either need properly staggered levels or to party with more people. It was pretty decent experience though.
It also turns out there's apparently a feature where you can use other people's mazes with their runes. So I may be able to try another maze without winning 13 default mazes.