Sudoku started life as "Number Place" in a 1979 American puzzle magazine, was perfected and named in Japan in the 1980s, and by 2005 was in every newspaper on earth. The appeal is purity: no vocabulary, no trivia, no luck — just one rule applied eighty-one times.
Fill the nine-by-nine grid so every row, every column, and every three-by-three box contains the digits one through nine exactly once. Here you get three difficulties whenever you want them, plus a daily puzzle that's identical for every player — same grid, same challenge, compare away. Pencil marks and a mistake indicator round it out.
Tip: Scan for the digit that is already placed in most boxes — it is usually the easiest one to finish locking in across the grid.
Yes — one shared grid per day, so you and a friend can compare times on the identical puzzle. The easy, medium, and hard boards are separate and fresh whenever you want one.
Noting the candidate digits a cell could still hold. Past the easy level, sudoku is mostly about tracking candidates — pencil marks are how you spot pairs and forced placements.
Harder boards start with fewer given digits and demand deeper technique — easy solves with basic scanning, hard expects real pencil-mark logic.
Yes. Tap a cell, then tap a number on the on-screen pad. The same board works with a keyboard on desktop.
Enjoying Sudoku? Try Sweep or Five next, or browse all games.