Product Description: The 4Set Zooshine Vantage & Advanced level metal brain puzzles are special designed for the person who want more challenge in puzzles games.It condenses Chinese traditional culture with unique creative. Linked together these wire pieces do come apart with the right strategy. Patience is a virtue.The brain teasers are very good toys for parent-child, party games,family entertainment,killing time and office relax.Package included:4PCS Advanced Metal Brain Teasers.instruction paper called "challenge guide"TIPS:***If you want more fun and Challenge,please DO NOT refer to the solution "challenge guide" at the very beginning.The really most interesting thing is exploring,not the result.