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 (home, stats, settings, result, help) • Non-personalized ads to limit tracking

■ A new challenge every day Every midnight, one Today's Challenge unlocks for every player worldwide. Difficulty steps up across the week: • Monday: Beginner • Tuesday: Easy • Wednesday: Medium • Thursday: Hard • Friday: Expert • Saturday & Sunday: Master

■ Streak rewards Finish the daily challenge day after day, and DayDoku gives you more allowed mistakes and hints per game. • 3 days: +1 mistake • 7 days: +1 hint • 14 / 30 / 60 / 100 days: more bonuses unlock Miss a day and the streak resets — so keep showing up.

■ Free Mode in six difficulties Play whenever you want. Pick from Beginner, Easy, Medium, Hard, Expert, and Master to match your mood.

■ A clean playing experience • 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 are saved in separate slots — starting one never overwrites the other

■ Light and fast • Fully offline — works without internet • Minimal design with full dark-mode support • Korean and English

■ Who it's for • Anyone looking for a quiet brain workout on the commute or before bed • Habit-builders who want a tiny daily ritual that sticks • Sudoku fans who hate ads getting in the way of play

Today's puzzle is waiting. Start your streak.