Hand-forged by a museum trained, traditional blacksmith.
Basic (B): Only a few steps, so good for beginners and in social settings.
Intermediate (I): More steps than the basic design, but straightforward.
Difficult (D): Multi-step sequences; some are combined maneuvers from the basic and intermediate categories. Often with close tolerances that require precise movements.
Complex (C): Many moves and flexible chains require a lot of concentration to solve these designs.