Sudoku Unlimited

Play solo, or solve one board together in two-player online co-op with a room code.

Settle into a quiet puzzle, notice one useful clue, and enjoy the moment when a tangle of possibilities becomes a clear next move. Sudoku Unlimited is a welcoming place to learn, a satisfying place to practise, and a reason to sit down for just one more puzzle.

A small ritual, or a puzzle shared

A daily puzzle gives you a reason to come back. Share a room code with a friend to solve together online, or enjoy a friendly contest for points. You can also connect over your local network. Build personal records, earn milestones, and make each session your own.

Find your feet, one small discovery at a time

Begin with small grids and follow a guided journey of 98 puzzles across ten chapters. Short explanations introduce new ideas gradually, while useful tools open as you progress. Grow from your first confident placement to larger boards and unfamiliar rules, with room to understand every step.

Let familiar logic surprise you

Explore Classic, Jigsaw, Killer, Arrow, Thermo, Sandwich and Miracle Sudoku. Practise a favourite variant, choose your mood with three difficulty settings for fresh Classic puzzles, or explore the 140-puzzle collection. There is always another small discovery waiting at your desk.

Keep your place and your train of thought

Pencil notes, undo and redo, bookmarks, rule explanations and candidate tools help you follow your own reasoning. Choose a readable board palette, settle in with gentle instrumental music, or hide the clock in Zen mode. Your unfinished solo puzzle saves its entries, notes and history, ready for your return.

Features at a glance

Two-player online co-op or points mode using a room code, plus LAN play.

238 Sudoku challenges: 98 guided puzzles across ten chapters, from 4×4 to 6×6 and 9×9 grids, plus 140 puzzles in a separate collection.

Seven Sudoku styles: Classic, Jigsaw, Killer, Arrow, Thermo, Sandwich and Miracle.

Fresh generated Classic puzzles with three difficulty settings and repeatable variant practice.

A separate collection of 140 puzzles, combining prepared and generated puzzles.

A daily puzzle, personal records and nine achievement milestones.

Pencil and group notes, undo/redo, bookmarks, candidate inspection, rule checks and helpful highlights.

Automatic saving of unfinished solo puzzles, including notes and move history.

XP, levels and streaks, with board palettes earned through puzzle milestones.

Mouse, keyboard and controller controls.

Zen mode, an optional timer, contrast options, reduced motion and optional backgrounds.

Original instrumental music with separate music and sound-effect volume controls.