Have you ever been about to finish a puzzle, when suddenly you realize there are more holes left than you have pieces? With [Nikolaos’s] 3D printed sliding puzzles, this will be a problem of the ...

The cube, of course, is the compact Rubik’s Cube, the bestselling 3D combination puzzle (a tasteful amount of memorabilia is strewn about the house) originally known as the Magic Cube, that Rubik ...