Sudoku (Greatest Games)

About Sudoku (Greatest Games)

Sudoku needs no introduction: a 9x9 grid split into nine 3x3 boxes, with some digits given. You fill every empty cell so that each row, each column and each box holds the digits 1 to 9 exactly once. Harder puzzles give fewer starting numbers.

You tap a cell and tap a number, or type it, and tap the same number again to clear it. Notes mode lets you pencil in small candidate digits while you reason, and a cell turns red if its number clashes with one already in its row, column or box. Each day brings four different puzzles, Easy, Medium, Hard and Very Hard, each timed separately; the clock runs only while you are at the board, and a fast finish earns a speed bonus.

Sudoku is one of the daily games on Greatest Games, a site of word and logic puzzles. A new puzzle goes up every day at midnight US Eastern, the same for everyone, and it plays free in the browser with no account or download. A free account opens the Sudoku archive of every past puzzle by date.

How to play Sudoku (Greatest Games)

1. Open Sudoku on greatest.games and choose a difficulty.
2. Tap a cell, then tap or type a digit from 1 to 9.
3. Use Notes to pencil in candidates while you reason.
4. Make sure no digit repeats in any row, column or 3x3 box.
5. Fill every cell to complete the grid.

Tips

• Scan each box for digits that can only go in one place.
• Use notes on harder grids; pairs of candidates often unlock the next step.
• Red cells mean a clash; fix them before going on.
• Start with Easy and work up through the levels on the same day.

Questions