I made a maze-generating program which then lets you run through the maze afterwards: http://scratch.mit.edu/projects/17358777/

This program makes use of the concept of “stacks” (which are really just the same as lists, except things are only added to or removed from one end of the list.) I also created a program that demonstrates using lists as stacks with this robot arm program: http://scratch.mit.edu/projects/17457737/