Kaizen Sudoku: Smart Hints

Kaizen Sudoku is a calm, 100% ad-free Sudoku game where beautiful design, smart learning, and unlimited puzzles come together—free to play, with no ads and no subscriptions, ever. Master classic Sudoku one puzzle at a time. Every hint moves you forward with logic: it fixes a wrong number first, or fills in the next cell that can be deduced—never a random guess. 5+ difficulty levels from Beginner to Legend, 20+ hand-crafted themes, and a distraction-free design make every game a pleasure. LEARN AS YOU PLAY Go beyond trial and error. Every puzzle is graded by the solving techniques it requires, from simple singles to X-Wing and Swordfish, so each level sharpens your logic step by step and helps you become a stronger Sudoku player with every puzzle you solve. DAILY SUDOKU CHALLENGE A new puzzle every day. Keep your streak alive, earn monthly trophies, and make Sudoku part of your daily routine. 100% AD-FREE, FREE TO PLAY The full game is free and ad-free—no purchase needed. Every puzzle, every difficulty level, and every feature is free to play, with 3 free hints in every game. Earn points as you solve and spend them on extra hints or a second chance. Want more? Optional one-time purchases: All Themes unlocks every premium theme, including future ones; Lifetime Premium adds unlimited hints and continues on top; credit packs give you extra hints or continues. No subscriptions, ever. PLAY YOUR WAY Pencil notes with auto-clear, undo without limits, optional mistake highlighting, detailed statistics, and Game Center leaderboards give you full control over every game. Keep multiple puzzles in progress and pick up right where you left off—even offline. Available in 10+ languages. DESIGNED FOR CALM 20+ hand-crafted themes with night variants, soft colors, and carefully chosen typography create a relaxing place to focus. No clutter, no interruptions—just you and the puzzle. From your first Sudoku to your thousandth, from a quick Daily Challenge to a deep Legend puzzle, Kaizen Sudoku helps you improve while making every game enjoyable.