9 × 11 is the largest board on the site: nine columns by eleven rows of playable cells in the classic magazine proportions. The extra rows mean more interlocking down runs, longer deduction chains, and positions where progress comes from combining several techniques — bounding, combination elimination, and pair logic — rather than any single trick.
Budget a proper session for these. The timer is there if you want it, but large Kakuro rewards a slower rhythm: sweep the board for magic blocks first, pencil-mark the tight clues, and let each placed digit ripple through its crossings before hunting for the next opening.
If a board fights back, the combination tables and the how-to-play guide cover every technique these puzzles need. For a shorter sit, drop back to 8 × 8 or play today's daily.