A strange little side quest
Between one round of Pretty Tidy and the next, this is worth knowing: Alexey Pajitnov created Tetris in 1984 after drawing inspiration from pentomino puzzles, then simplified the idea around shapes made from four squares. The timeline takes another interesting turn: Pong was field-tested in California bars in 1972 and helped launch the modern arcade-game era. It is a good reminder that simple game mechanics can carry a surprising amount of history.