Sudoku Today

Sudoku Today is a free sudoku site at sudoku.today that has run since 2019. Its home page leads with "Today's Sudoku", a dated list of puzzles that changes every day and is the same for every visitor. On 14 November 2026 the list held 20 grids, among them Sum Frame, Little Killer, XV, Greater Than, Non-fully marked Consecutive, Clone, Even, Anti Knight, Group Sum, Makodoku, Search 9, Color Sudoku and a hybrid of Greater Than and Sum Frame, along with plain classic grids.

Every puzzle is a 9x9 grid where each row, column and 3x3 box holds the digits 1 to 9 once. Each variant adds one more rule, written above the grid. In Sum Frame the numbers around the edge give the sum of the first three digits in that direction. In XV an X marks two neighbours that add to 10 and a V two that add to 5. In Anti Knight the same digit may never sit a chess knight's move away. Each puzzle card shows its difficulty, how many players have solved it, their median time and their average number of steps, so you can choose a gentle grid or a long one before you start.

The board works with a keyboard or by touch. You pick a cell and type or tap a digit, keep pencil notes, undo and redo, save a grid part way and check it. A leaderboard under each puzzle lists solvers by time and steps, with a replay of their solve. A Solution link sits under the grid for anyone who gives up.

Beyond the daily set, each of the more than 50 variant types has its own page with hundreds of earlier puzzles to filter by level, and there are pages for killer, samurai and classic sudoku. A free account saves progress across devices and records your times, but the daily grids play without one. The site can also be added to a phone's home screen as a web app, and it runs in 19 languages, from English and French to Japanese, Thai and Ukrainian.

It suits solvers who already know classic sudoku and want a different rule each time, and players who like to compare their time with others on the same grid. The pages carry Google ads around the board.