DayDoku: Daily Sudoku

🧩 One puzzle a day — DayDoku, a minimalist sudoku game built around a daily habit. DayDoku is a clean, focused sudoku app designed for one quick puzzle a day. Wake up your brain, build a streak, and enjoy the quiet satisfaction of showing up. ■ Why I made this I'm a developer who loves playing sudoku. I got tired of how aggressive ads were in the apps I used — they kept interrupting the very thing I came to do. So I built the app I wanted to use. DayDoku makes one promise: you will never see an ad while you're solving a puzzle. ■ Ads, kept minimal • No ads while you're playing — the promise • No interstitials, no video ads • A single small banner only on menu screens • Non-personalized ads to limit tracking ■ A new challenge every day Every midnight, one Today's Challenge unlocks for every player. Difficulty steps up across the week: • Mon: Beginner • Tue: Easy • Wed: Medium • Thu: Hard • Fri: Expert • Sat & Sun: Master ■ Streak rewards Finish the daily challenge day after day to earn more allowed mistakes and hints per game. Rewards stack at 3 / 7 / 14 / 30 / 60 / 100 days. Miss a day and the streak resets. ■ Free Mode in six difficulties Play whenever you want — Beginner, Easy, Medium, Hard, Expert, Master. ■ Game features • Notes (pencil marks) for candidate numbers • Hints fill in one correct cell • Undo / Redo • Pause, auto-save, and resume any time • Daily and Free Mode in separate save slots ■ Light and fast • Fully offline • Minimal design with dark-mode support • Korean and English Today's puzzle is waiting.