Infinity: 100 world-record puzzles rated SE 10.4 to 11.9, Everest and Golden Nugget among them. Every board now shows exactly how hard it is. Free, offline, no account.
suuudokuuu is Sudoku the way it should be: fast, beautiful, and honest about difficulty. Seven levels, from a gentle Newbie board to Infinity — the hardest Sudoku puzzles ever composed. No ads pretending to be puzzles, no accounts, no nonsense. Just you and the grid.
EVERY PUZZLE, RATED
Most apps label a board "expert" and hope you don't look closer. We put a number on it. Every puzzle carries a Sudoku Explainer rating on the 1.0 to 12.0 scale serious solvers use, shown right in the level pill on the board, in your history, and on every link you share. A built-in explainer tells you what the number actually measures — how hard the puzzle is to reason through, not how few clues it has.
INFINITY: THE WORLD'S HARDEST SUDOKU
A curated set of 100 world-record puzzles rated SE 10.4 to 11.9. Arto Inkala's Everest and AI Escargot. Golden Nugget. Platinum Blonde. Kolk, Patience, Fata Morgana, Red Dwarf. These are the grids the solving community made famous, and most people never finish one.
HELL, RE-CURATED
Hell is now 1,544 verified 17-clue puzzles, every one rated SE 6.6 or higher. Seventeen clues is the fewest a Sudoku can have and still have exactly one solution — but a low clue count alone doesn't make a puzzle hard, so we rated the whole corpus and kept only the boards that fight back.
YOUR SOLVING, MEASURED
The redesigned statistics screen shows your hardest solve, your recent average difficulty and the level you play most. The SE spectrum plots every puzzle you've finished across the scale. Your arsenal counts every technique you've actually used — naked pairs, X-Wing, swordfish and further — so you can watch your repertoire grow.
CHALLENGE A FRIEND
Rival mode sends your exact puzzle to a friend as a share link, with your recorded run attached. They play the same grid you did and race your time move for move. Bragging rights, settled.
WATCH IT BACK
Every finished game replays move by move, and each history card carries a summary of the techniques that solved it.
PLAY YOUR WAY
Pick Classic, Gold or Newspaper, or open the live-preview theme editor and make every cell, line and highlight yours. Built-in contrast validation keeps custom themes readable in light and dark. On the web there's full keyboard control: arrows to move, digits to place, Space or N for pencil mode, Shift and a digit for candidate marks, A for auto-candidates.
EVERYTHING ELSE YOU'D WANT
• 7 difficulties, Newbie to Infinity
• An SE difficulty rating on every puzzle
• Full theme engine with light and dark support
• Rival challenges via share link
• Move-by-move replay with technique analysis
• Technique-aware scoring
• 13 languages
• Works fully offline
• No account, no sign-up, ever
• Free and open-source
suuudokuuu is built for people who actually love Sudoku, not people who want to be sold a subscription. Download it, pick a difficulty, and find out what your number is.
Learn more at www.suuudokuuu.com.
Thank you for the great free game. I’m really enjoying it. When finishing a game, regardless of the difficulty level, the end screen says that it’s a “newbie” level
Developer Response
Thanks! Already fixed and will come in the next release! Any other feedback is highly appreciated
Hints now teach instead of telling. Each one names the technique, lights up the cells that force the move, and walks you through the reasoning step by step before anything is placed. On phones the hint player now fills the space below the board as a fixed panel, so the text is bigger and nothing jumps between steps.
• Undo and redo, with honest scoring: an undo hands back exactly the points its placement earned, so replaying the same cell can never pay twice.
• Hints stay off Nightmare, Hell and Infinity unless you switch them on, and both hints and undo are hidden in Hardcore.
• Daily challenge on its own tab: the same puzzle for everyone each day, with a current and best streak and your recent solves.
• Difficulty now means what it says — every board is generated until it really needs the techniques its level promises.
• Kinder to hands and eyes: bigger touch targets on the board and number pad, a reduce motion setting, larger digits, Calm play without a score, and full respect for your device text size.
• New High contrast and Colorblind safe themes, with every board color pair checked against WCAG AA and states told apart by lightness and outlines instead of hue.
• Full screen reader support: cells, digits and controls announce their role and state, and hint steps, mistakes and wins are spoken as they happen.
• The Notes control now sits alone at the thumb edge, mirrored for left-handed play, and on desktop the hint panel finally has a readable size.
• Fixed: moves built from several logical steps are credited to the technique behind them instead of counting as guesses, auto-candidates now drop what a hint eliminated, cells no longer keep the highlight or digit color of an earlier move, and the white digit on the selected cell is back.
• Faster: the web version paints straight away instead of waiting for the whole download, and the app itself is 5.5 MB smaller.
Version 2.12.1
The developer, Vitalii Yehorov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Contact Info
Usage Data
Diagnostics
Other Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Vitalii Yehorov
Size
62.1 MB
Category
Board
Compatibility
Requires iOS 16.4 or later.
iPhone Requires iOS 16.4 or later.
iPad Requires iPadOS 16.4 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
