Kakuro – derived from the Japanese kasan kurosu (加算クロス, ‘addition cross’) is my new favorite puzzle game, for now. (Sooner or later I always go back to playing Scrabble against ‘Expert Computer’ as my favorite).
I find Kakuro games in online newspapers, and print them out larger, so that I can write clues for myself into the tops of the boxes. I see there are free puzzles available online as well.
Kakuro scratches the same itch as Sudoku but with that extra arithmetic layer that makes each solved grid feel earned. The origin note about the Japanese kasan kurosu is a nice touch — it’s wild how these paper puzzles translated so well to phone screens.