WSudoku

Six difficulty tiers - Easy, Medium, Hard, Expert, Master and Titan.
Fresh puzzles - play newly generated boards with a unique solution.
Useful tools, when you want them - pencil marks, matching-number highlights, undo and redo, hints, automatic notes, box validation, and optional mistake checking.
A score that reflects your solve - assistance is accounted for, while personal bests and online difficulty leaderboards give you something to beat.
A new daily challenge - take on a rotating Daily Sudoku and compare validated runs on its leaderboard.
DUEL AT YOUR PACE
Challenge a local bot rival across six skill levels.
Find a rival through Quick Play, invite a Steam friend, or create a private room with a short code.
Solve the same puzzle with a synchronized countdown, live completion progress, and server-validated results.
BUILT FOR DESKTOP
Native 64-bit builds for Windows and Linux.
Play with a mouse, keyboard, touchscreen, or gamepad.
Choose windowed, borderless, or fullscreen display modes, with adjustable interface scale and graphics options.
Available in 16 interface languages.
Online Duels, global and Daily leaderboards, Daily Rewards, and synced progression require an internet connection and access to WSudoku's online services.