Daily Sudoku

This is a free daily Sudoku with a twist: everyone in the world gets the same puzzle each day, generated from the calendar date, so times are genuinely comparable and solving every day builds a visible streak. Alongside the daily there are unlimited Easy, Medium and Hard practice puzzles, and every game auto-saves in your browser — close the tab mid-solve and it resumes exactly where you left off, timer included.

Puzzles are generated properly rather than pulled from a fixed list. The generator first builds a complete valid grid, then removes clues one at a time, re-checking after every removal that exactly one solution still exists. That uniqueness guarantee matters: every puzzle here can be finished with pure logic, never guessing. Difficulty is controlled by how many clues remain — 43 givens on Easy down to 27 on Hard — and the daily rotates through a seven-day cycle that climbs from easier grids to a weekly Expert challenge.

The solving aids match what serious players expect: pencil-mark notes, an optional auto-candidates mode that computes and prunes the possibilities in every cell as you play, mistake highlighting you can switch off, undo, a fill-one-cell hint, a mistake counter, a timer and a shareable result card. On desktop the whole game is keyboard-playable — 1–9 to place, N for notes, H for a hint, arrows to move around the grid.