The Tavern Puzzle Collection has four categories of difficulty, starting with Basic and ending with Complex. Basic: Only a few steps. Good for beginners and in social settings.Intermediate: More steps than basic designs, but straightforward.Difficult: Multi-step sequences; some are combined maneuvers from basic and intermediate categories. Often with close tolerances that require precise movements.Complex: Many moves and flexible chains, requiring a lot of concentration. Not recommended for novices.All puzzles are made from 6mm steel; some include wooden beads. Dimensions: 8” – 14” long, 4” – 6” wide. Weight: 12 – 20 ounces. Puzzles are packaged in a drawstring muslin bag with information sheet that shows the puzzle and the objective. Solutions are not packaged with the puzzles.