A strange little side quest
One reason puzzles keeps producing good game ideas around Monkey Go Happy: Stage 651 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. Another piece of context lands nicely beside it: In 1958, Tennis for Two used an analog computer and an oscilloscope to turn simple physics into a playable tennis-like demonstration. That is the kind of background detail that makes another attempt at Monkey Go Happy: Stage 651 feel a bit more connected to the history of play.