Pocket Sudoku
The classic number puzzle, now in your pocket
Solve unlimited handcrafted boards across three difficulties, chase a daily challenge with streaks, and climb the global leaderboard. Pencil in notes, tap for a hint, or race the clock in Speed Run mode.
How It Works
Solve Anywhere
Unlimited, logic-solvable boards across Easy, Medium, and Hard — all fully playable offline, with your progress saved automatically.
Daily Challenge & Streaks
Everyone plays the same board each day. Keep your streak alive, compare solve times, and climb the leaderboard for every tier.
Notes, Hints & Speed Run
Pencil in candidates to plan ahead, tap for a nudge when you're stuck, or switch to Speed Run mode and race the clock.
See It In Action
Real screens from Pocket Sudoku.
About the Game
Sudoku is the world's most popular logic puzzle: a 9×9 grid, a handful of starting clues, and one rule — every row, column, and 3×3 box holds the digits 1 through 9 exactly once. There is no arithmetic and no luck. Every board is a self-contained deduction with a single correct answer.
Pocket Sudoku brings that pure, meditative challenge to your phone with clean handcrafted boards, forgiving notes and undo, and a daily puzzle that gives you a reason to come back. Whether you have five quiet minutes or a long train ride, there's always another board waiting.
How to Set Up
- The Grid: A 9×9 board divided into nine 3×3 boxes.
- The Givens: Some cells start filled in. These clues are fixed and define the puzzle.
- The Goal Line: Every row, column, and box must end up containing each digit 1–9 exactly once.
- Difficulty: Choose Easy, Medium, or Hard — fewer givens means a harder solve.
Objective
Fill every empty cell so that the completed grid satisfies all three constraints at once: no digit repeats within any row, any column, or any 3×3 box. Reach that state using logic alone — each correct placement narrows the possibilities for the cells around it until the whole board resolves.
Rules & Techniques
One Through Nine
Every row, every column, and each 3×3 box must contain the digits 1–9 with no repeats.
Start With the Givens
The pre-filled clues are fixed anchors. Every empty cell is deduced from them — the givens never change.
Scan and Cross-Hatch
Sweep rows and columns through a box to find the one cell where a digit can legally go.
Pencil in Candidates
Use notes to record every digit a cell could still hold, then eliminate them as you place values.
Naked & Hidden Pairs
When two cells in a unit share the same two candidates, those digits are locked out of every other cell in that unit.
No Guessing Required
Each board has a single solution reachable by logic alone — a wrong entry trips the mistake counter, not a dead end.
Difficulty Tiers
| Mode | What to Expect |
|---|---|
| Easy | The most givens — a relaxed solve built on simple scanning. |
| Medium | Fewer clues; expect cross-hatching and naked pairs. |
| Hard | Minimal givens that demand advanced logic and patience. |
| Daily Challenge | One shared board a day — build a streak and climb the leaderboard. |
Tip: The daily board is the same for everyone — solve it to grow your streak.
Solving Strategy
- Scan First: Before writing anything, look for digits that already appear several times — they're the easiest to place next.
- Work the Boxes: Focus on one 3×3 box at a time and ask where each missing digit can legally sit.
- Use Pencil Marks: Fill crowded cells with candidate notes so eliminations become obvious instead of guesswork.
- Look for Singles: A cell with only one candidate, or a digit with only one home in a unit, can be placed immediately.
- Chase Pairs and Triples: Locked pairs and triples remove candidates elsewhere and often unlock a chain of easy placements.
- Keep the Daily Streak: Solve the daily board every day to grow your streak and hold your spot on the leaderboard.
- Learn From Hints: Stuck? A hint reveals the next logical step — use it to spot the pattern you missed, then keep solving.
Get Pocket Sudoku
Out now on Google Play. The iOS build is in review — play in your browser in the meantime.