Three rules. That is the whole game.

Every run of white squares has a number at its head, and the digits you write must add up to exactly that. Use one to nine at most once per run. Each square belongs to two runs at once, so where the two agree on a single digit, you have your answer. You do not need to know kakuro to start: the story teaches it one small board at a time, beginning with four cats and a handful of squares.

A journey, a library, and a puzzle every morning

Twenty-five chapters across five storybook Acts, with a trail of paw prints that inks in as you go and something new in the scene at the end of every chapter.
The digits are cats. Nine cats with names, colors, and personalities sit right on the keypad, from Pip the cream cat to Onyx, who turns up at midnight like he owns the place.
Starts tiny, grows with you. Your first board uses only four digits; by the last chapter you are solving grids that would have looked impossible on day one.
Then 2,000+ more. Finish the story and all four Free Play tiers open at once, from Kitten Steps to Purrfect Puzzlers.
A daily challenge arrives with Free Play: the same puzzle for everyone on the same date, with no account and no connection needed.
Tools that teach, including pencilmarks in five colors, a combination row that shows every way the current clue can be made, and unlimited undo.

No ad interrupts your solve

While a puzzle is open, the screen is yours. Deduction hints are free, and optional rewarded help is always your choice. Ads appear between puzzles and on the menus to keep everything free, and one optional purchase permanently removes banners and interstitial ads. There is never a subscription.

Ready when you are

Play every puzzle offline with no account or sign-up required. Catkuro is made for phones and tablets, with a layout for each.

Prefer a classic, cat-free cross-sum library? See Kakuro Haven.