Free Sudoku Games Online: Number Logic Puzzles

Sudoku asks you to fill a grid of numbers so that each row, column and box contains every digit once. No arithmetic is required, only careful logic and a bit of patience. The page includes Sudoku Classic, a long series of Weekend Sudoku puzzles, Xmas 2020 Sudoku and Calcu Doku, a related number-logic puzzle, so there is plenty to work through if you enjoy this kind of thinking.

Solving without guessing

Good solving starts with scanning for cells that can only hold one number, then moving on to pairs and other patterns. Pencil marks, when a game offers them, let you track possibilities without committing. Numbered series, such as the Weekend ones, make it easy to keep going with a fresh grid after each solve. A few entries on the page are not sudoku at all, so check the title and thumbnail before you start.

A puzzle can last five minutes or an hour, depending on the grid. There is no clock pressure unless the game adds one, which makes it a fine way to wind down. Taps on phones and clicks on computers both work for entering digits. If you get stuck, stop for a minute and look for the row or box with the most numbers, then try it again. Fresh eyes often spot what tired ones miss, so do not be afraid to walk away briefly.

Frequently asked questions

Is sudoku about maths?

Not really. The digits are only symbols, so you never add or multiply. It is a logic puzzle about placing each number once per row, column and box.

What should I do when I am stuck?

Look for cells with only one possible digit, then check rows, columns and boxes with the most numbers filled in. A short break often helps. If the game offers hints, use them sparingly.

Can children play sudoku?

Yes, with patience. Younger children may start with smaller grids if the game offers them, or work alongside an adult. The standard 9x9 grid suits older children and teens.