A strange little side quest
Between one round of Spot Differences and the next, this is worth knowing: The first crossword puzzle book appeared in 1924 in a cautious initial printing of 3,600 copies, complete with a free pencil. The timeline takes another interesting turn: Spacewar! appeared on MIT's PDP-1 in 1962 and became one of the earliest influential computer games shared among programmers. The screen is modern; the urge to test skill, pattern and timing definitely is not.