Back in the ancient days before social media and online gaming, humans came up with some pretty ingenious ways to test their brains and pass the time. Over the eons, each unique civilization beat boredom (and flummoxed their friends) with increasingly clever and complex puzzles. We’ve peered back through time to curate this collection of history’s most challenging brain teasers – ready to addle the sharpest modern minds. Offering varying levels of difficulty, this striking set of metal disentanglement puzzles requires creativity, concentration and deft motor skills – and, once you’ve discovered their secrets, these attractive puzzles make irresistible conversation starters for your den or home bar.