Object: separate the middle ball (with two parts) from the frame into the frame. Level 4 Difficulty (Where level 1 is easier and level 6 most difficult). Your experience could be differentiated. Small, compact, metal box, beatifully designed brain teaser puzzle. Protect your skills when taking things off and putting behind them; recommended for 12 adults (Some very bright 8 to 11 year olds may also enjoy.)