Big Sudoku

Sudoku that actually lasts. Samurai Sudoku and 16×16 "Super" Sudoku for when you want a puzzle that takes more than a few minutes — and classic 9×9 Sudoku for when you just want a quick one.

These are proper puzzles. The Samurai and Super Sudokus come in four levels of difficulty and none of them are trivial. If you complete one, you will have genuinely solved it. There are no cheats and no hints to carry you past a square you're stuck on. The 9×9 Sudokus come in the same four levels, from a gentle warm-up to genuinely fiendish.

THREE WAYS TO PLAY
• 9×9 — the classic, quick and satisfying
• Samurai — five overlapping 9×9 grids for a much longer solve
• 16×16 "Super" — a giant grid using numbers and letters (0–F)

HELP WITH THE LEGWORK, NOT THE THINKING
The app takes care of the bookkeeping so you can concentrate on the puzzle:
• Auto pencil marks that fill in and update every possible number for each square
• Highlight every square a chosen number could go in, so patterns jump out
But nothing here shortcuts the mental process — the solving is still all yours.

A NEW CHALLENGE EVERY DAY
• A fresh daily puzzle for each of the three styles, every single day
• Build and protect completion streaks, and earn streak freezes as you go
• Over 1,800 puzzles across dozens of packs, plus the daily challenges

BUILT FOR HOW YOU PLAY
• Everything auto-saves, so keep several puzzles on the go at once
• Play completely offline — no connection needed
• Light and dark themes
• Made for pen-and-paper traditionalists too: share an image of any puzzle to print and solve the hard way, with no on-screen assistance

BIG PUZZLES, ANY SCREEN
Because these grids are large, the app is at its best on a tablet or a large-screen phone. But every grid pinch-zooms, so with a little patience you can play on almost any device.

An optional ad-free purchase removes ads entirely.