Play free →
Play free →
Choose a mode and difficulty to get started.
Everything's free and runs right here in your browser — no account, no download.
Plenty of numbers already filled in. Perfect for a quick mental warm-up or a relaxed coffee break.
Play Easy →The sweet spot. You'll need proper scanning and a few notes, but nothing that ties your brain in knots.
Play Medium →Now we're talking. Expect to lean on pencil marks and spot patterns most casual players miss.
Play Hard →Bare-bones boards for serious solvers. One puzzle can happily eat a whole commute. You've been warned.
Play Expert →The timeless 9×9 grid with 5,000+ hand-tuned puzzles. Every board has exactly one solution.
Challenge another player in real-time multiplayer. Race to solve the same board and prove who's faster.
A fresh puzzle every day. Complete daily challenges to keep your streak alive and earn bonus rewards.
Easy, Medium, Hard, and Expert levels — each genuinely different. Grow from beginner to master at your own pace.
Jot down candidate numbers in any cell, just like solving on paper. Toggle notes with a single tap.
Went down the wrong path? Step back as many moves as you need. No penalty, no guilt.
Stuck? Get a hint that reveals the technique behind the next move — learn as you play, not just the answer.
Tap any number and every matching cell on the board lights up instantly. Spot patterns at a glance.
Wrong entries are flagged in real time so you catch errors early before they cascade into bigger problems.
Choose from multiple visual themes to match your style. Light, dark, and more — personalize your game.
See how you rank against players worldwide. Climb the leaderboard by solving faster and more accurately.
Earn badges as you hit milestones — complete difficulty levels, maintain streaks, or conquer special challenges.
Track your daily solving streak. Keep it alive with consistent play and watch your streak count grow.
Track how long each puzzle takes. Pause whenever you need a break — your time pauses too.
Earn points based on speed, accuracy, and difficulty. The fewer mistakes and hints you use, the higher your score.
Race another player on the same board