This is how students can get started. The code is not complete. The only thing we need to add is for the green dot: 1) 4 arrow movement control; 2) color touching sensing. Please see the complete example for the code. After this is done, students should work on drawing their own challenging mazes. We can run a competition: each student create their own maze, but they have to pass it and show it to the teacher, then they get 5 points. Then, they start to try each other's maze, if they can pass the other's, they get 1 point, while the other lose 1 point. We will see the final winners in the end.
