Sudoku: Offline game

A clean sudoku app for people who just want to play sudoku.
No ads. No subscriptions. No notifications. Ever.

Three difficulty levels
Easy (15 min), Medium (30 min), and Hard (~60 min) — each with a different hint allowance, so the challenge scales meaningfully rather than just filling in more cells.

Daily Challenge
One puzzle a day, the same for every player worldwide. Complete it to keep your streak alive. Your current streak is visible on the home screen — a quiet reminder, not a pressure tactic.

Built for focus
The interface is dark, minimal, and free of anything that doesn't belong on a sudoku board. No animations competing for your attention. No banners sliding in at the wrong moment.
Notes mode lets you pencil in candidates directly in cells. An optional error highlight catches slip-ups without breaking your flow. The timer can be hidden if you prefer to play without it watching you.
Your progress saves automatically every 10 seconds — close the app, come back later, pick up exactly where you left off.

Stats that matter
Per-difficulty statistics: games played, games won, and your best time. Nothing more than what's useful.

What's not here
Ads. Push notifications. Social features. Leaderboards. Anything designed to pull your attention away from the puzzle in front of you.

Sudoku is a game of logic and patience. This app tries to stay out of the way and let you play it.