- 北極数独 - provides a focused Sudoku experience with a clean interface, adjustable difficulty levels, hints, candidate notes, undo and statistics to track your progress.

Features

• Standard 9x9 puzzles with Easy, Medium, Hard and Expert levels
• Optional hints, error checking and step-by-step guidance
• Pencil marks, undo/redo and automatic save
• Daily puzzles and local statistics to monitor improvement
• Offline play and lightweight performance on most devices

Play - 北極数独 - at your own pace using notes and hints; the app supports casual play and focused practice without distractions.

How to play

In - 北極数独 - place numbers 1 to 9 so each row, column and 3x3 block contains every digit once. Use pencil marks for candidates, the hint button for guidance, and the undo control to correct mistakes.