Sudoku Core: Number Puzzle

Take a quiet break with daily Sudoku, thoughtful notes, and hints that show the logic behind each move.

Classic Sudoku, with more room to think.

Sudoku Core is a clean, offline number puzzle for a quiet break or a satisfying logic challenge. Open the app, choose your level, and start solving in seconds.

• Five difficulty levels: Easy, Medium, Hard, Expert, and Master
• Every puzzle has one solution and is checked against the game’s logic solver
• Smart Coach gives a nudge, explains the deduction, and lets you choose whether to reveal a move
• Pencil notes, undo, redo, erase, and cell-first or number-first entry
• Daily Challenge, streaks, and a calendar of completed days
• Optional on-device daily reminder, only after you choose to enable it • Share a short solve summary when you choose; the puzzle and solution stay private • Local statistics, solve times, and small personal achievements
• Light, dark, and high-contrast themes
• VoiceOver and TalkBack descriptions for individual cells
• Play offline, with no account and no advertisements during a puzzle

Your unfinished game and progress stay on your device. Optional reminders are scheduled locally. Sharing is always initiated by you and sends only a short result summary to the destination you select. No sign-up, online leaderboard, or analytics account is required.

The Daily Challenge refreshes at 00:00 UTC, so players share the same puzzle for each UTC date. It works offline. An optional reminder can be scheduled locally at a time the player chooses.

Sudoku Core is a number puzzle made for calm focus—from a first easy grid to a more demanding logic solve.