Iuliia Pilipeichenko/istockphotoVintage jigsaw puzzles are not just nostalgic entertainment; they also double as lucrative ...

and even 3D wooden guardians to assemble. While the price tag might seem high at first glance, the innovative features make ...

Wood grain is also one key to making an easy puzzle much harder. “To pass the time on planes,” Danner says, he’ll flip a whole puzzle face down and use the wood grain as his only image guide.