Printable Kakuro Puzzle (Free PDF)
A cross-sum puzzle with clue totals in the black squares, a handful of starter digits and the full solution on the second page.
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Kakuro is a crossword built from sums. Each run of white squares has to add up to the total printed in the black square at its head, using the digits 1 to 9 with no digit repeated inside a run. Easy is an 8x8 grid with about 36 white squares, medium a 9x9 with around 48, and hard a 10x10 with roughly 66. A short how-to-play note sits under the grid, so you can hand the sheet to somebody who has never seen a kakuro before.
The generator builds a full solution first, then removes the printed digits one at a time, checking after every removal that the grid still has exactly one answer. A dozen or so starter digits survive that process and are printed in the grid; they are what makes the puzzle open without trial and error. Nothing here was assumed to be correct: the uniqueness check runs on the finished sheet before it is drawn.
Page two prints the same grid with every square filled in, in red, so you can check a single square without reading the whole answer. The puzzle page leaves the white squares large enough for pencil marks, which is how most people work a kakuro: write the two or three digits a run still allows in the corner of a square and rub them out as the crossing runs narrow them down. The sheet is plain vector artwork with nothing to type into, so print as many copies as you like for a classroom, a commute or a waiting room.
