Games Like Sudoku

Sudoku is the classic pen-and-paper logic puzzle — no luck, just deduction. If you enjoy that calm, methodical problem-solving, these free logic and number puzzles offer the same satisfying 'aha' moments. Reason your way through, rule out the impossible, and watch each solution click into place. Every game plays instantly in your browser, no download or sign-up, on desktop, tablet or phone. Sharpen your mind with one below.

The reason sudoku travels so well is that it is not really about numbers. The digits are just labels for nine things that each have to appear once per row, column and box — swap them for colors, shapes or animals and the puzzle is identical. That is why the pen-and-paper world has a whole family of grid puzzles built on the same promise: one unique solution, reachable by elimination, with nothing hidden and nothing left to chance.

The four games below are drawn from that family. One is sudoku proper on a smaller grid, and the other three replace the digits with a route, a picture or a seating rule while keeping the deduction intact. All four are untimed in the sense that matters — the board will wait while you think.

Why each of these works if you like Sudoku

Mini Sudoku Puzzle

Actual sudoku, just on a grid that fits a phone without pinching: 4×4 boards split into 2×2 boxes, then 6×6 boards with boxes three cells wide and two tall. The deduction is identical to the full-size game — every row, column and box takes each digit exactly once — but even a hard board resolves in a few minutes. Selecting a cell highlights its row, column and box so conflicts are visible at a glance. A contradicting digit flashes red and costs one of three allowed mistakes. Start here if you want sudoku rather than something sudoku-adjacent.

CapyDoku Puzzle

The star-battle branch of the family, and the gentlest on the eye. A grid is split into colored territories, and you seat exactly one animal in every row, every column and every territory, with no two neighbours touching. Single-tap a cell to cross it out as ruled out, double-tap the one you are certain about. Nothing is timed and nothing moves on its own. The first twenty levels grow the grid from 4×4 to 9×9 so the rules land before the space gets large; after that the grid stays put and the reasoning deepens instead.

Number Path Puzzle

Sudoku's logic applied to a route instead of a set of digits. Every board hides one snaking path that visits all of its cells exactly once, numbered upward, with a handful of numbers left printed as clues. You rebuild the missing stretches by dragging from a number into a touching empty square. There is no arithmetic anywhere in it — only spatial reasoning about where one unbroken line can physically fit — and tapping any number you placed unwinds the route back to that point, so backtracking costs nothing but time.

Pixel Grid Puzzle

Picross, also known as nonograms or griddlers: number clues along the rows and columns encode a hidden picture, and solving the grid colors it in. It is the most visual puzzle here and the one with the most obvious payoff, since each solved board reveals what it was drawing. You flip between filling cells you can prove and marking ones you can rule out — the same prove-and-eliminate rhythm as sudoku pencil marks. 200 boards, the first twenty hand-drawn and the rest seeded, so puzzle 137 is the same board for every player.

If you are new to the family, the natural order is Mini Sudoku for the rules, CapyDoku for a gentler variant of the same elimination logic, then Pixel Grid or Number Path once you want the deduction pointed at something other than digits.

Frequently asked questions

Which of these is closest to real sudoku?

Mini Sudoku — it is the same game with a smaller grid, not a variant. The other three keep sudoku's style of reasoning but replace the digits with a route, a picture, or a seating rule.

Do these require guessing?

They are built to be reasoned out rather than guessed, and boards are run against an automated solver during development to confirm they can be completed. In CapyDoku that guarantee is strongest on the early levels, which are the ones specifically verified to need no guessing at all.

Is there a timer?

Nothing forces a move. Some boards run a clock that feeds a score — Number Path starts one on your first placement, and Pixel Grid scores faster solves higher — but the puzzle will sit there indefinitely while you think.

What happens if I make a mistake?

It depends on the game. Mini Sudoku and CapyDoku allow three mistakes before an attempt ends, flagging each wrong placement immediately. Number Path lets you unwind a route freely at no cost beyond time.

Are these free?

Yes, in full — every level, no account, no download, and nothing locked behind a purchase.