Five grids as one.
Infinitely generated Samurai and Classic Sudoku, beautifully native and yours offline. On iPad, write your answers in ink.
Download on theApp Store
Write it like paper
Write your answer in any cell. Samuraiku reads your handwriting as the ink settles; scratch it out to erase.
A Sudoku that never runs out
Samurai & Classic
Play the five-grid Samurai plus, or a clean 9×9 Classic. Pinch and pan the Samurai, or double-tap a grid to zoom in and work it.
Infinite puzzles
Every board is generated on the spot with a guaranteed unique solution. There's no finite pack to run out of.
Write it in
On iPad, jot digits by hand with Apple Pencil (or a finger) and Samuraiku reads your handwriting. Or tap the number pad on any device.
Five difficulties
From gentle Beginner to fiendish Expert, each tuned by the exact solving techniques a puzzle needs.
Pencil marks
Pencil in candidates with Notes, or let auto-candidates fill them for you. Placing a digit clears it from the cells it rules out.
Scan a printed puzzle
Point your camera at a Sudoku from a newspaper or book. Samuraiku reads it on-device, auto-detects Samurai vs Classic, and hands you a playable board.
Game Center
Daily and Weekly time leaderboards, pure-solve Ronin boards, and 21 achievements with hand-carved hanko seal badges.
Daily & Weekly
A fresh Daily Classic and Weekly Samurai for everyone, with streaks that reward you for coming back.
Learn & hints
Guided lessons walk you through real techniques, and smart hints name the logic, from naked singles to X-Wings, so you actually improve.
Combo scoring
Score points for completing rows, columns and boxes, with ×2 and ×4 multipliers when you clear several at once in a single move.
Share & challenge
Send any puzzle to a friend with a link. They open the very same board and race your time, then compare on the leaderboard.
Yours everywhere
Keep several games going at once in the puzzle browser, synced across your devices with iCloud and fully playable offline.
Screens
Camera ingestPoint it at a printed puzzle
Write it inApple Pencil handwriting on iPad
Collect the seals21 Game Center achievementsOne price. Nothing else.
No ads. No in-app purchases. No subscriptions. No accounts. No data collected or sold. Buy Samuraiku once and it's yours on all your devices, for good.
Download on theApp Store