A strange little side quest
One reason puzzles keeps producing good game ideas around Classic Freecell Solitaire is that its history is full of strange turns. The first crossword puzzle book appeared in 1924 in a cautious initial printing of 3,600 copies, complete with a free pencil. The surprising part is how quickly the next milestone followed. Pac-Man went on sale in 1980, and its creator Toru Iwatani famously linked the character's shape to a pizza with a slice missing. The details change, but the appeal of learning a system and trying again is remarkably persistent.