To start the program do the following:
1. Copy the following link
2. In APGS go to File Open from Web
3. Paste the link and <enter>

You will see Picture menu with the three first names aa1 aa2 and aa3:

The first program aa1 shows this picture (that explains how to build a Labyrinth of type CC.

If you click on aa2 you then need to click on thr TryIt button to go thr

A video that shows how to build a labyrinth of the CL type (Level 2)

Here is a snap shot of the process:

If you select the program aa3 and click on the TryIt button you get to a screen that has slider that you can move. You start getting a "feel" for what an infinite Labyrinth will look like. Here are two snap shots.