6×6 Mini Sudoku is a compact variant of the classic Sudoku puzzle, played on a 6-row, 6-column grid divided into six rectangular 2×3 boxes. Your goal is simple: fill every cell with a digit from 1 to 6 so that each digit appears exactly once in every row, every column, and every 2×3 box.
Unlike the full 9×9 grid — which can take 15–30 minutes — a 6×6 Mini Sudoku solves in 2–5 minutes, making it the perfect puzzle for a short break, a classroom exercise, or a quick mental warm-up before tackling harder problems. The 36-cell grid is small enough that you can hold the entire state in your head without a notebook.
6×6 Sudoku uses the same logical foundation as every other Sudoku variant: no guessing, no arithmetic, only pure deductive reasoning. The techniques you master here — cross-hatching, naked singles, hidden singles — are the identical tools used by world-class Sudoku champions on the hardest 9×9 puzzles. The mini format is simply a faster, more accessible training ground for those same skills.
4×4 Mini
For absolute beginners. Digits 1–4, 2×2 boxes, under 60 seconds.
6×6 Mini
The sweet spot. Digits 1–6, 2×3 boxes, 2–5 minutes. You are here.
9×9 Classic
The full game. Digits 1–9, 3×3 boxes, 10–30 minutes.
Three techniques cover virtually every 6×6 puzzle at all difficulty levels. Master these and you'll never need to guess.
The single most powerful technique in 6×6 Sudoku. For each digit 1–6, look at the 2×3 boxes and determine which rows and columns it already occupies. If a digit appears in two of the three rows within a set of boxes, it is confined to the remaining row — and column constraints will pinpoint the exact cell.
Example
Suppose '3' is already placed in row 1 and row 2 of the left three columns. '3' must appear in row 3 within those columns. If '3' also exists in column 2 and column 3, then '3' must go in the column 1, row 3 cell.
Work digit-by-digit from 1 to 6. Digits that appear most frequently will be easiest to place first.
A Naked Single occurs when a cell has only one possible candidate left after eliminating all digits already present in its row, column, and 2×3 box. In a 6×6 grid, this is remarkably common — placing one Naked Single often triggers a chain reaction of other forced placements.
Example
A cell sees digits 1, 2, 4, 5, and 6 across its row, column, and box. The only missing digit is 3 — that cell must be 3. Since you only have 6 digits total, each placed cell eliminates one fifth of all possibilities in its row/column.
Use the Notes feature (pencil marks) to track candidates. When any cell has exactly one note — place it immediately.
A Hidden Single is when a particular digit can only legally go in one cell within a row, column, or 2×3 box — even though that cell appears to have multiple candidates. The digit is 'hidden' because the cell has other notes too, but logic proves it must be that digit.
Example
In a 6-cell row, the digit '5' can only fit in one cell (all other cells in the row either already contain a digit or have '5' eliminated by column/box constraints). Even if that cell's notes show [2, 3, 5], you know it must be 5.
After placing naked singles, scan each row, column, and box for each digit 1–6. If a digit has only one possible home in a unit, place it.
Easy
Medium
Hard
New to 6×6 Sudoku? Follow these six steps and you'll solve your first puzzle in minutes.
The 6×6 grid has 6 rows, 6 columns, and six 2×3 rectangular boxes. Every row, every column, and every 2×3 box must contain the digits 1, 2, 3, 4, 5, and 6 exactly once. There are 36 cells total — roughly half the count of a standard 9×9 puzzle.
Easy 6×6 puzzles start with around 18–24 digits pre-filled ('givens'). Medium puzzles have 14–18, and hard puzzles have as few as 10. Study the board and look for boxes or rows that are nearly complete — these are your starting points.
Pick digit '1'. Mark every cell where '1' already appears. For each 2×3 box that doesn't have a '1' yet, eliminate positions conflicting with '1's in that box's rows and columns. If only one position remains in a box, place '1' there.
For cells you can't immediately resolve, tap the Notes button and write all valid candidates. The game will auto-eliminate candidates as you fill adjacent cells. In 6×6, notes are shorter — each cell can have at most 6 candidates — making them easy to read at a glance.
After scanning, look for any cell with only one pencil mark left — that is a Naked Single; place it immediately. Each placed digit updates the board, removing candidates from adjacent cells and often revealing more Naked Singles. For easy 6×6 puzzles, this step alone may solve the entire board.
If the board stalls, look at each row, column, and 2×3 box and find a digit that can only appear in one cell. That's a Hidden Single — place it confidently. This technique handles most medium-difficulty 6×6 puzzles without any guessing.
The compact 6×6 grid delivers the same cognitive workout as 9×9 in a fraction of the time. Repeated exposure trains your brain to spot empty cells, constraint overlaps, and candidate eliminations almost instantly.
A 6×6 puzzle takes 2–5 minutes — ideal for a coffee break, commute, or a quick mental reset between work tasks. Short, satisfying, and mentally stimulating without the 20-minute commitment of a full 9×9 puzzle.
Every technique used in 6×6 Sudoku maps directly to 9×9: scanning, naked singles, hidden singles. Mastering these on a smaller grid builds the intuition and speed you need to tackle harder 9×9 difficulties confidently.
The structured, rule-based nature of Sudoku induces a flow state — researchers call it "focused attention meditation." The 6×6 format is small enough to hold the entire board in working memory, making it particularly immersive.
6×6 Sudoku is the recommended format for teaching logical deduction to children aged 8 and up, and is equally popular with adults returning to puzzles after a long break. Simple enough to learn immediately — rich enough to keep you hooked.
Choose Easy (scanning only), Medium (hidden singles required), or Hard (introducing naked pairs) to match your skill level. As you improve, advancing difficulty is just one click away — no new rules to learn, only deeper strategy.
Everything you need to know about 6×6 Mini Sudoku.
Fill every one of the 36 cells with a digit from 1 to 6. Each row (6 cells), each column (6 cells), and each of the six 2×3 rectangular boxes must contain every digit from 1 to 6 exactly once. No digit may repeat within the same row, column, or box.
The core rules are identical — place digits so no row, column, or box repeats. The differences are in scale: 36 cells vs 81 cells, digits 1–6 vs 1–9, and 2×3 boxes vs 3×3 boxes. Solve times are much shorter (2–5 min vs 10–30 min), making 6×6 perfect for quick sessions. The techniques used — scanning, naked singles, hidden singles — all transfer directly to 9×9.
Easy 6×6 puzzles typically take 1–3 minutes for beginners and under 60 seconds for experienced solvers. Medium puzzles average 3–5 minutes. Hard puzzles can take 5–10 minutes depending on how quickly you spot hidden singles and naked pairs. Times improve quickly with regular practice.
No. You can play 6×6 Mini Sudoku immediately without any account or download. Creating a free MySudokuWorld account unlocks progress tracking, XP rewards, achievement badges, and access to the global leaderboard — but it is entirely optional.
Yes. MySudokuWorld provides on-demand hints that reveal the next logical step without giving away the full solution. There is also a Notes (pencil mark) feature that helps you track candidate digits in each cell — an essential tool for medium and hard difficulty levels.
6×6 Sudoku is an excellent starting point. The 36-cell grid is small enough to visualize completely, and with only 6 possible digits, candidate lists stay short and manageable. It teaches the core Sudoku techniques (scanning and naked singles) in a low-pressure environment before you graduate to the full 9×9 grid.
4×4 Sudoku uses digits 1–4 and 2×2 boxes, and solves in under a minute. It is purely introductory. 6×6 Sudoku uses digits 1–6 and 2×3 boxes, introduces more complex constraint patterns, and requires active logical deduction — especially at medium and hard difficulty. 6×6 is significantly more rewarding and challenging without becoming overwhelming.
Finished your 6×6 puzzle? Here's where to go next.
Even faster — digits 1–4 in 2×2 boxes. Perfect for absolute beginners.
Play now →Graduated to the full grid? Easy is the natural next step after 6×6.
Play now →The techniques you learned in 6×6 Hard prepare you perfectly for Medium.
Play now →A fresh puzzle every day — build your solve streak and earn bonus XP.
Play now →Browse all mini Sudoku variants and difficulty levels in one place.
Play now →In-depth guide covering all mini Sudoku strategies and solving methods.
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