Separate the 4 parts and put back together! All of the pieces fit loosely and it seems as though they would be easy to take apart. However, one is soon at a loss, as the puzzle gives no hint about how it is solved.
Eureka 515114" Huzzle Cast Nutcase Puzzle
EUREKA 515095" Huzzle Cast Padlock Puzzle
Eureka 515051 "Huzzle Cast Ring****" Puzzle
Eureka 515111" Huzzle Cast Chain Puzzle
Eureka 515088" Huzzle Cast Duet Puzzle
Eureka 515113" Huzzle Cast Enigma Puzzle