The "Advanced Knots" series includes 20 videos of challenging coils, knots, hitches, and bends. To see the videos. click on the link above called "Video-Teacher". To purchase the interactive CD-ROM for Windows, contact any Boy Scouts office to order "Knot Tying: Advanced Knotting" from the current BSA catalog; it's catalog item #36109. The Boy Scouts will appreciate your support!