Sudoku Overview

Sudoku is a logic-based number puzzle game played on a 9×9 grid. The goal is to fill each row, column, and 3×3 box with digits 1-9 without repetition.

How to play: Start by identifying cells with only one possible number. Use elimination techniques to narrow down possibilities. Work systematically through rows, columns, and boxes.

Difficulty levels: SudokuPuzzles.net offers 8 difficulty levels from Easy to Insane, with progressive unlocking system for advanced challenges.

Printable & solver: Download free PDF puzzles for offline solving. Use our online solver to check solutions or get hints when stuck.

Sudoku Features

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Achievements & Progress Tracking

Track your Sudoku solving progress with our comprehensive achievement system. Unlock achievements for speed solving, daily streaks, total active days, and difficulty unlocks. All progress is saved locally in your browser - no account required.

Achievement categories include: Speed achievements (complete puzzles within time limits), Streak achievements (consecutive daily play), Milestone achievements (total active days), and Unlock achievements (unlock advanced difficulty levels).

Note: Achievement data is stored in browser localStorage, not tied to IP address. Each browser/device has independent achievement progress.

Achievement Categories

  • Speed Achievements: Complete puzzles in under 60s, 2min, 3min, 5min, or within difficulty-specific baseline times
  • Streak Achievements: Maintain daily streaks of 7, 14, 21, or 30 days
  • Milestone Achievements: Reach total active days of 7, 14, 21, or 30 days
  • Unlock Achievements: Unlock Evil and Insane difficulty levels by completing prerequisite challenges
  • Progress tracking: View your achievement progress and unlock status
  • Local storage: All achievements saved in browser localStorage
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Achievements

Track your progress and unlock achievements as you complete puzzles.

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0% Complete

Speed Achievements

🏅

Speed – 60s

Complete a puzzle in under 60 seconds

🏅

Speed – 120s

Complete a puzzle in under 2 minutes

🏅

Speed – 180s

Complete a puzzle in under 3 minutes

🏅

Speed – 300s

Complete a puzzle in under 5 minutes

🏅

Speed – Easy

Finish Easy under baseline time (3 minutes)

🏅

Speed – Medium

Finish Medium under baseline time (5 minutes)

🏅

Speed – Hard

Finish Hard under baseline time (8 minutes)

🏆

Speed – Expert

Finish Expert under baseline time (12 minutes)

🏆

Speed – Master

Finish Master under baseline time (15 minutes)

🏆

Speed – Extreme

Finish Extreme under baseline time (20 minutes)

🏆

Speed – Evil

Finish Evil under baseline time (25 minutes)

🏆

Speed – Insane

Finish Insane under baseline time (30 minutes)

Streak Achievements

🔥

7-Day Streak

Daily streak for 7 days

🔥

14-Day Streak

Daily streak for 14 days

🏆

21-Day Streak

Daily streak for 21 days

🏆

30-Day Streak

Daily streak for 30 days

Milestone Achievements

Total 7 Days

Total active days 7

Total 14 Days

Total active days 14

🏆

Total 21 Days

Total active days 21

🏆

Total 30 Days

Total active days 30

Unlock Achievements

🔓

Unlocked Evil

Unlock Evil difficulty

🔓

Unlocked Insane

Unlock Insane difficulty

🔓

Extreme Unlocked

Complete 10 puzzles on Expert difficulty

🔓

Insane Unlocked

Complete 10 puzzles on Extreme difficulty