Maze Rats most resembles a lightweight version of Dungeon World in terms of its fundamental dice mechanics, but with brilliant twists of its own. The randomized magic system is perhaps my favorite element; rolling up the spell "Illuminating Tar" and having to figure out what its effects might be got my creative juices going in a way that few RPGs manage.
I'm sharing the system with a group of my high-school and middle-school students who have never experienced tabletop RPGs, and I think it's nearly perfect as an introduction to the hobby. Truly excellent.
[5 of 5 Stars!]