Tap a cell, then a number · use Notes for pencil marks · 3 mistakes ends the game
Sudoku is the classic number-placement puzzle, rebuilt to play smoothly in your browser. Fill the 9×9 grid so every row, every column, and every 3×3 box contains the digits 1 through 9 with no repeats. A fresh, uniquely-solvable puzzle is generated every time you load the page, so you never replay the same board. Six difficulty modes run from Easy down to Extreme by how many clues you start with. Pencil-mark notes, undo, hints, selection highlighting, and a three-mistake limit are all built in. It works with keyboard, mouse, or touch and needs no sign-up. For ages 10 and up, it's a timeless workout for logic, patience, and concentration.
More games: Number Road, Pattern Finder, 2048.