Selected from hundreds of years of puzzle history and dozens of ancient societies, these 100 classic puzzles will test your solving skills as never before. From “The Triangles of Babylon,” dated around 1900 BC, to “Achilles and the Tortoise,” a famous mathematical paradox devised by the Greek philosopher Zeno, here are some of history’s premier puzzles. These brainteasers come from the finest minds of the past and from around the world; placed alongside the best riddles and puzzles of recent generations, they create an irresistible challenge for any solver.