Puzzle & Thinking Games · 70

Tiny fact jackpot

Kakuro was long known in English-language puzzle magazines as Cross Sums before its Japanese name became internationally popular. It looks like a crossword, but every clue is really a small arithmetic constraint. The category has another odd corner too: The modern jigsaw puzzle grew from 'dissected maps' made in the eighteenth century. Mapmakers mounted geography lessons on wood and cut them into pieces for students to reassemble.