DOUBLE TROUBLE _ Tavern Puzzles Heavy Metal Disentanglement-Style Brain Teaser _ BONUS Twisted Nails Puzzle Old fashioned heavy metal brain teaser disentanglement puzzles. Bonus: Twisted Nails Separate the Nails Puzzle. Objective of DOUBLE TROUBLE is to remove the LONG NARROW SHUTTLE (indicated by BLUE arrow) Replacing the shuttle to the starting position is equally as challenging. Rated as a level 4 "Very Difficult/Very,Very Severe" (on a scale of 1 to 4). On this scale both level 3 and 4 are very challenging. Packaged in sturdy WHITE BOX, cloth bag and with solution.