Puzzle & Thinking Games · 74

Puzzle difficulty is not just solution length. A short solution can be hard if the key idea is hidden, while a long solution can feel easy once the pattern is clear. That connects nicely with a historical detail: Ernő Rubik designed his famous cube in the 1970s as a way to explore three-dimensional movement before it became a worldwide puzzle phenomenon. Nothing becomes more suspicious than a perfectly empty corner of a puzzle board.