# Ultimate Sudoku Free Online

Get ready to play Sudoku free online in your browser. This well-made Ultimate Sudoku game has lots of features and is fun to play.

This game is part of the free online brain games collection.

To begin, click the Small, Medium, or Large button under the picture of the game. This opens the game in a pop-up window.

If you like this game, you might enjoy Microsoft Sudoku.

## Ultimate Sudoku Free Online - Instructions

See below for a summary of the rules of sudoku. For detailed instructions, including advanced techniques, visit the Sudoku Instructions page.

Ultimate Sudoku. From the Sudoku Master game developer:

A puzzle game from Japan that has conquered the whole world. Fill in the empty cells with numbers from 1 to 9.

In each row, column, or 3x3 block, each number can occur only once. Three different game modes:

Cell first: First click on the cell you want to fill in, and then select a number. Number First: first click on the number, and then on the cell in which you want to enter this number. Note Mode: Write down the option in an empty space using the keyboard or the number buttons.

Upgrade your Sudoku solving skills and become a Sudoku master!

NOTE: The instructions below were written for the Adobe Flash version of this game originally. Most of the explanation still applies.

It has advanced features including cell tagging and row/column highlighting. You can choose from three levels of difficulty.

Choose from Easy, Medium, Hard, and Expert levels of difficulty.

You can even make notes right in the sudoku grid when you need to guess between two or more numbers.

Sudoku is a math game. The goal is to find the missing numbers in a 9 by 9 grid by following a few simple rules. The rules may be simple, but solving a sudoku puzzle is always a challenge.

HOW TO PLAY. The first screen that displays in this online sudoku game is the difficulty selection screen. Click on the sudoku difficulty you want to try.

Choose between Easy, Medium, Hard, or Expert depending on your skill level. If you've never played sudoku before, choose Easy mode.

The sudoku board consists of a square 9x9 grid. This grid is itself divided into nine 3x3 subgrids.

When you begin, some numbers are provided, but many of the individual squares in the sudoku grid are blank.

You goal in this free Sudoku online game is the same as standard sudoku. Find the one, and only one, correct numeric entry for each blank square in the grid such that all the rules of sudoku are satisfied.

Here are the rules of Sudoku:

• Each row must contain the numbers 1 through 9, in any order but exactly once.

• Each column must contain the numbers 1 through 9 as well.

• Each 3x3 subgrid must contain the numbers 1 through 9.

So whenever you enter a number on the grid, verify that number does not already appear in that row, that column, or that 3x3 subgrid.

To enter a number on the grid in this Sudoku free online game, first click the location in the grid where you want the number to be set. Then click the appropriate number from the number list shown outside the grid.

For instance, to enter the number "5" on the sudoku board, first click the location where you want to 5 to be entered. Next click the "5" tile that you see along the outside the the board. (See the screen image at left.)

I really enjoy solving sudoku puzzles, both on paper and online sudoku games. I'm not fantastically good at sudoku, but I do love the challenge of solving number puzzles.

Sudoku trains numerical reasoning skills and concentration. That's what makes it a great brain game.

Play sudoku often to keep your brain sharp!

Want free sudoku printable pages? Go here.

Published: 02/07/2015
Last Updated: 10/09/2023

No sign-up or log-in needed. Just go to a game page and start playing!

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