Baekdoku 100 curated puzzles — then endless.
Finish all 100, then play endlessly at the level you choose.
0+∞ Learn more →
Give it a tap Tap a number,
Tap a number,
clear your mind.
Press the keycaps or keys 1–9 to fill the 9×9. Chain quick presses for a combo!
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Done!
Classic board
Four apps, at a glance.
Baekdoku 
Cheondoku
1,000×3 Slow and easy, a thousand at a time.
Calm — one before bed
Learn more →Hover a grid — each corner 3×3 is shared by two grids.
21×21 MandokuFive grids overlap. Samurai.
Learn more →0 sheets printed · tap to speed up
DokuBookMake it. Print it. Solve on paper.
Learn more → 0
Puzzles in Mandoku alone — 500 each of 4×4 and 6×6, 10,003 9×9, 100 samurai
Mini game Find the missing number
Find the missing number
5-round speedrun
One digit from 1–9 is missing. It gets harder: row → column → 3×3 box. Wrong answers add 1 second.
Example — which number is missing? 0.00
1234?6789
Samurai instincts Try Mandoku
At this speed, a 21×21 of five overlapping grids is no problem.
Today's fortune
Which one today?
Pull the lever to get today's app. Three in a row is a jackpot!
Pulls 0
JACKPOT Baekdoku
Beginner-to-intermediate 9×9. Finish them and keep generating at the difficulty you like.
JACKPOT Cheondoku
Three 9×9 paths — Zen, Sun, Moon — with 1,000 puzzles each, plus a 6×6 warm-up. No stress.
JACKPOT Mandoku
100 samurai puzzles on a 21×21 board, plus 4×4, 6×6 and 9×9. Four boards in one app.
JACKPOT DokuBook
Build a sudoku book at any difficulty and print it on A4 — cover, puzzles and answers.
Drag to browse →
Baekdoku · Home
Baekdoku · Start
Cheondoku · Zen
Cheondoku · Start
21×21 Mandoku · The full 21×21 and a zoomed-in view
Mandoku · Four boards
Mandoku · 6×6 mini
Mandoku · Man board
Mandoku · 9×9
A4 DokuBook · Make it in the app, print it on A4
DokuBook · Home
DokuBook · Generate
DokuBook · Play
DokuBook · How it works
DokuBook · A4 cover DokuBook · A4 puzzleType KINGDOKU on your keyboard.