Students started by writing out their name, following the lines on the grid paper.
Using a pencil they marked the start and finish of their maze. They connected them with the "solution path"
They erased "openings" in the solution path and added the tricks and traps. The used the lines of the graph paper for all their work.
They finished their images by tracing their pencil lines with mark. It made it very easy to see the lines when I ran them through the copier to make 2 copies for each student.
It was so much fun to listen to them design ways to trick people as they fill out their maze.
Of course some students went their own way but everyone had a blast, used lines successfully and I learned their names (or at least got a good start on it!)