Hints now teach the move, not just the answer. Killer hints walk you through cage totals, the digit sets a cage can hold and the rule of 45. Kakuro hints explain run totals and combinations, and Square Math and Cross Math hints show the equation behind each answer. Every Killer puzzle now has exactly one solution, so a correct digit is never counted as a mistake, and new Killer games are ready faster.

New: sign in with Google, or with Apple on iPhone and iPad, to keep your progress, streaks and the puzzle you're playing on all your devices. Make your profile yours with a name and a picture: your Google photo, your initials or one of 18 new avatars. Signing in is optional, so you can keep playing as a guest, and you can delete your account at any time from Profile.

New: Jigsaw Sudoku, with irregular pieces in soft colors. Math Match is rebuilt: match each sum to its answer against the clock, across 1,000 levels. Hints now teach the technique, like X-Wing. Killer adds a cage helper with every possible combination. Wins get a new celebration, with a spotlight for records. Plus the Denim theme, Zen is now Casual, a better fit on small and large phones, and fixes.

New: challenge a friend right from the Solved screen. A versus card shows your time to beat, and after a friend's challenge it shows who won, with a one-tap rematch. New Profile tab: your key numbers at a glance, with Pro, awards and settings in one place. Fixed: Pro now stays on when the store can't be reached, and Restore Purchases tells you when the store is unavailable. The Solved card also fits small phones better.

New: eye-friendly board themes. Paper, Sepia, Rose, Lilac, Mist, Graphite and Sage use softer colors that are easier on your eyes, and Ruby adds a bold red. Paper and Classic are free; the others come with Pro (the one-time purchase that also removes ads), or try one for 24 hours by watching an ad. Hints now always walk you through the steps. Fixed: digit sounds that skipped every other tap, leftover notes after auto-complete and hints, and the Home card now shows when today's daily is solved.

New: eye-friendly board themes. Paper, Sepia, Rose, Lilac, Mist, Graphite and Sage use softer colors that are easier on your eyes, and Ruby adds a bold red. Paper and Classic are free; the others come with Pro (the one-time purchase that also removes ads), or try one for 24 hours by watching an ad. Hints now always walk you through the steps. Fixed: notes are cleared after auto-complete and hints. The daily reminder is easier to find.

New: an optional daily reminder. Turn it on in Settings, pick your time, and get a heads-up before your streak ends. Featured This Week now keeps score: finished puzzles are marked Done, the win screen takes you straight to the next one, and there are three new achievements. Also fixed: the Square Math number keys on small screens, and Killer cage sums are now easier to read.

Sudoku Nova now speaks your language: the whole app is translated into 10 languages, including Portuguese, Turkish, Indonesian, Hindi, Spanish, German, French and Japanese. It follows your device, or you can pick one in Settings. Pausing now hides the board, and while paused you can watch a short ad for a free hint. Also fixed: the landscape layout on tablets.

New Mini Sudoku: a 6×6 grid for quick games. New Zen and Speed modes for Classic: play with no clock, or race a countdown. A fresh look for Home, Daily and Statistics, with your streak, monthly trophy and best times up front, and leaderboards and achievements one tap away. Prefer no ads? Remove them for good with a one-time lifetime purchase.

Our biggest update yet. New Diagonal Sudoku mode. Challenge a friend: share any puzzle and race their time. Complete every daily in a month to win its trophy, and join limited-time events that reveal a pixel-art picture as you play. After each win, see the toughest technique the puzzle needed, watch a replay of your solve, and track your pace in the new solve-time chart. Plus leaderboards and achievements.

Fixed an issue where watching a rewarded ad for a hint or auto-notes wouldn't always grant the reward on iPhone. Improved pencil-mark contrast on the selected cell across all themes — notes are now easier to read in dark mode and on the Killer board.

Fixed an issue where watching a rewarded ad for a hint or auto-notes wouldn't always grant the reward on iPhone. Improved pencil-mark contrast on the selected cell across all themes — notes are now easier to read in dark mode and on the Killer board.

Sudoku Nova just got a whole lot bigger! NEW PUZZLE TYPES Beyond classic Sudoku, take on Kakuro, Cross Math, Square Math, and a reworked Math Match — a whole library of number puzzles to master. A FRESH LOOK • Killer Sudoku redesigned with a cleaner board and clearer givens • A redesigned Explore tab to browse every game in one place • A streamlined Home screen that gets you playing faster CELEBRATE YOUR WINS A rewarding new win screen marks every solve — and lets you share your victory. NOW ON iPAD Full iPad support with a beautifully scaled, centered layout. Plus smoother animations and a host of stability fixes. Thanks for playing! We read every review.