MARBLE Cast Metal Puzzle from Hanayama Puzzles of Japan is a delightful and tricky brain teaser puzzle. It consists of two outer square prices which hold a ball shape. All fit together as a clever, compact puzzle. A Level 4 difficulty (on a scale of 1 to 6; where 6 is the most challenging.) EQUA Cast Metal Puzzle from Hanayama Puzzles of Japan is an equally delightful and tricky puzzle. It consists of two interlocked middle pieces which easily move around the outer frame. Objective is to remove from the outer frame. These are fascinating disentanglement brainteaser. Good tricky puzzles and will stump most players for some time. Separation of the pieces is a real test of positioning and planning. Re-assembly can also be a tricky puzzle. Both measures approximately 1.5 to 2 inches in length and diameter. Each puzzle is individually boxed. Marble and Equa are part of a series of 55 plus very interesting and mentally provocative metal brain teasers from the Hanayama Puzzle Company of Japan. Some serious puzzlers refer to these as disentanglement-style puzzles as they involve taking something apart and then re-assembling. Recommended for ages 12 to 105 years. A few bright 7 to 11 year olds may also enjoy, provided they are aware that forcing the puzzle could destroy it. BONUS: two black velveteen cloth drawstring storage pouches. The perfect way to store and carry around your puzzles. \ Returns, if necessary, are always processed promptly. Return of the entire new bundle required for any refund to process. MARBLE and EQUA - Two of most difficult and popular disentanglement puzzles from the Hanayama Puzzle Company of Japan. Marble Objective: Separate and then rejoin the four pieces. Level 4 Difficulty.. (where level 1 is easier and level 6 most difficult). Your experience could differ. Equa Objective: Separate the moving middle pieces from the frame. Then rejoin. Level 5 Difficulty. Small, compact, beatifully designed brain teaser puzzles. Each individually boxed. Bonus: 2 (two) Black velveteen cloth drawstring storage pouches. Measure e approximately 4 x 5 inches laying flat.