A strange little side quest
Put City Defense next to the history of strategy games and a few unexpected connections appear. Chess changed dramatically in Europe during the 15th and 16th centuries when the queen became the board's most powerful piece. And then there is this: 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.