A strange little side quest
Between one round of 3D Ping Pong 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. A second detail makes the picture even better: Archery was already on the Olympic programme in 1900, boxing joined the modern Games in 1904, and basketball became a medal sport in 1936. That gives 3D Ping Pong a little more company than it first appears to have.