Free · No download · Any device
Kakuro Online
Play Kakuro directly in your browser — no installation, no account, no cost. Free Kakuro loads instantly on desktop, tablet, and phone. Pick a difficulty, fill the grid, and let the logic pull everything into place.
Kakuro is a number-logic puzzle on a crossword-style grid. Each run of white cells must sum to the clue in the adjacent black cell, and no digit 1–9 may repeat within a run. The game is pure deduction — every correct puzzle has a single solution reachable by logic alone.
Why play Kakuro online?
No setup
Open the URL and a puzzle is ready. No app store, no install, no account — just the game.
Works on every device
Desktop, laptop, tablet, phone — the board adapts to your screen. The same URL works everywhere.
Candidate overlay
Each empty cell can show a 3×3 digit matrix. Toggle candidates to track what is still possible without writing on paper.
Smart hints
Tap "Hint" to have the solver highlight the next cell with a forced move and explain why that digit is locked in.
Combination reference
Every valid digit set for each sum–length pair is one click away. No more mental enumeration mid-solve.
Unlimited puzzles
The generator produces a new verified puzzle on demand. You will never run out of boards at any difficulty.
How to play Kakuro online
Open freekakuro.com in your browser. A puzzle loads immediately — no waiting, no setup screen. The default difficulty is medium. To change it, open the controls and select Easy, Hard, or Ultra Hard before generating a new puzzle.
Reading the grid: Black cells with two triangles are clue cells. The number in the upper-right triangle sets the sum for the white run going across (to the right). The number in the lower-left triangle sets the sum for the white run going down. Each run of white cells must be filled so that the digits sum to that number, with no repeated digit in the run.
Making a move: Click or tap a white cell, then type a digit (1–9) or tap a number on the on-screen pad. If a digit violates a run constraint, the cell turns red. Correct placements stay neutral until the whole puzzle is solved.
Using candidates: Toggle the candidate overlay to show a 3×3 mini-grid in each empty cell. Click individual candidates to mark or unmark them as you eliminate possibilities. This is the fastest way to track which digits are still valid without relying on memory.
Need to look up which digits can sum to a given clue? The combination reference lists every valid digit set for each sum and run length. For deeper strategy, the technique library covers intersection logic, residual sums, and naked pairs.
Difficulty levels
Easy Kakuro online
Short runs where many moves are forced from the opening position. Most cells can be solved with a single combination lookup. Good for first-time players or anyone warming up. Easy Kakuro guide →
Medium Kakuro online
Longer runs and more intersecting constraints. Candidate tracking becomes useful here, and cross-run intersection logic starts to matter. The right step up once easy puzzles feel automatic. Medium Kakuro guide →
Hard Kakuro online
Dense grids with heavy overlap between across and down runs. Forced moves are sparse — you will need intersection and residual-sum reasoning throughout. Hard Kakuro guide →
Ultra Hard Kakuro online
Maximum grid density. Every constraint matters and even small missteps cascade. For experienced solvers who want a serious challenge. Ultra Hard Kakuro guide →
Online tools included
Kakuro helper calculator: Enter a target sum and run length to see every valid digit combination instantly. Essential when you are working with long runs and need to narrow down the candidate set quickly. Open the helper →
Combination reference: A full static table of every sum × length pair from 3 through 45. Faster to scan than computing combinations in your head. Open combination reference →
Technique library: Covers the strategies that take you beyond basic forced moves — intersection logic, residual sums, naked pairs, and more. Opens in a new tab so your puzzle state is preserved. Open technique library →
Kakuro solver: If you want to check a specific puzzle configuration or see how a solver approaches a position, visit the solver page. Open solver →
New to Kakuro online?
Start with the rules page — it covers grid notation, the two core rules, and the first deduction technique in under five minutes.
Then open an easy puzzle. Short runs mean most cells have very few valid combinations, so forced moves appear quickly and the logic loop becomes intuitive fast.
The Kakuro for beginners guide walks through a complete solving approach: reading clues, the forced-combination technique, intersection logic, and residual-sum chains.
Once you are comfortable with easy, try medium and use candidate mode to track your deductions. The transition from easy to medium is where the game really opens up.
Kakuro online FAQ
- Can I play Kakuro online for free?
- Yes. Free Kakuro is entirely free — no ads, no sign-up, no paid tiers. Generate puzzles at any difficulty as often as you like.
- Do I need to install anything?
- No. The game runs as a web app in any modern browser. No plugin, no app download, no account required.
- Does online Kakuro work on mobile?
- Yes. The board is fully responsive and the number pad is touch-optimised. Candidates and hints work the same way as on desktop.
- How many Kakuro puzzles are available online?
- Unlimited. A fresh puzzle is generated each time you start a game, so there is no fixed pool to exhaust. Every board is verified to have a unique logical solution.
- What is the difference between Kakuro online and a Kakuro book?
- The logic is identical. Online play adds a candidate overlay, hint system, auto-play, and combination reference — tools that paper cannot provide. You can also generate a new puzzle instantly instead of buying a new book.
- Is there a daily Kakuro online?
- See the daily Kakuro page for the daily puzzle format. For on-demand play at any difficulty, use the main board.