Five grids overlap. Samurai.
100 samurai puzzles on a 21×21 board, plus 4×4, 6×6 and 9×9. Four boards in one app.
On iPhone? Try Samurai mode in Baekdoku Premium →
Five 9×9 grids sit on a 21×21 board, each sharing one 3×3 box at its corners. A digit you place in a shared cell lands in two grids at once, so solving one grid is already solving its neighbour. 40 easy, 35 medium, 25 hard — 100 puzzles, every one with a single solution.
500 mini 4×4, 500 mini 6×6, 10,003 classic 9×9 and 100 samurai. Each size unlocks in order from puzzle 1, and progress is tracked separately per size.
The board on the home screen draws all 10,000 classic 9×9 puzzles as 10,000 cells. Every puzzle you finish fills one cell, and the 11 levels stack up as bands of their own colour — your whole practice at a glance.
Ivory paper, amber accents, ink-brown type — a bright tone that stays easy on the eyes. Prefer dark? Switch it in settings.
Your first 3 puzzles are ad-free. After that, one interstitial every 2 puzzles, with a 90-second cooldown so they never pile up. No banners. Premium removes them entirely.
Premium · one-time purchase (not a subscription)
4×4, 6×6 and 9×9 are free with ads. Price varies by region — check the store.
