Sudoku - 静心数独

Sudoku, made calm. A beautifully minimal sudoku game built for focus, not clutter. Every puzzle has exactly one solution, hand-graded across five difficulty levels so the challenge always fits your mood. FEATURES • Five difficulties — Beginner, Easy, Medium, Hard, Expert, each with genuinely distinct challenge • Unique solutions — every puzzle is guaranteed to have one and only one answer • Daily Challenge — a new puzzle every day, the same for everyone • Smart hints — stuck? Get a hint that shows you the next logical step, never a random guess • Pencil marks — jot candidate numbers just like on paper • Mistake tracking, undo/redo, and an auto-notes helper • Statistics — track your best times, win rate, and daily streak • Five calming themes and nine languages • Fully offline — no ads, no account, no tracking. Your game stays on your device. Take a breath and fill the grid.