# Microsoft Sudoku - Play Free Online

Microsoft Sudoku is the classic sudoku puzzle game. It has advanced features such as Notes and Hints.

This version includes two modes, Regular sudoku and Irregular sudoku. Each mode has four levels of difficulty: Easy, Medium, Hard, and Expert.

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

This is the official game created by Microsoft Studios and is free-to-play online here.

## Microsoft Sudoku - Instructions

This is an HTML5 game. It does not require the Adobe Flash player.

For detailed instructions on how to play sudoku, please see the Sudoku Instructions series on this site.

For in-game instructions, see below as well as the How to Play section of the Menu in the game.

If you like Microsoft Sudoku, you might enjoy the other sudoku games on this site, such as Ultimate Sudoku. If you prefer to solve on paper, see my 100 Free Printable Sudoku Puzzles page.

HOW TO PLAY. Click on the pen button, then left-click on a square and drag the cursor up and down to enter your "pen" answer. You can also type in the number.

If you're not sure of an answer, you can select the pencil button instead. Mouse over a square and click on the number(s) you want to enter.

Use simple logic to fill in the sudoku puzzle's nine rows and nine columns with numerals 1-9. Each number can only be used once in a given row or column.

Enter the correct number in every grid square to win! Sudoku has two modes: Pen and Pencil.

You can "pencil in" several guesses per square. Click on the hint button, located in the main menu, to see possible answers highlighted in red. You can also click on the progress button to see if you've made any mistakes.

### Microsoft Sudoku - Overview

Microsoft Sudoku is a puzzle game with numbers and a 9x9 grid. The goal is to fill the entire grid with numbers from 1-9 so that no number repeats itself in any of the 9 rows, columns, or 3x3 houses.

Some numbers have been placed for you. These numbers cannot be changed.

Controls. First, select a number from the list on the right side of the puzzle. Then, select any square on the grid to enter the number you chose. Or, you can select the square first and then select the number.

With using a keyboard, use the arrow keys to select a square and then type any number.

Use the "Notes" (Pencil) button to toggle between numbers and notations. Use the "Erase" button to clear a square.

Keyboard Shortcuts: Arrow Keys = Select a square; Numbers = Enter a number; Delete = Erase the selected square; CTRL+Z = Undo.

Hints. Block Duplicates will not allow a number to be entered twice in the same row, column, or 3x3 house. Show Incorrect will highlight mistakes with a red box.

If a blank square on the board is selected, Show Guides will highlight possible numbers that could occupy that square. Conversely, if a number from the list is selected, Show Guides will highlight possible squares on the board which the selected number could occupy.

Use the Hints (Light Bulb) button to reveal the correct value of any cell.

Tips. Place notes! Mark where each number could be positioned by using notes.

Remember that two of the same number cannot be placed in the same house, or on the same row or column.

Start by looking where each number (1-9) could go within a single 3x3 house. See if there are any numbers that have only one possible position.

Then, check each row and column. Some numbes may have multiple possible positions within a house, but only one valid position on a row or column.

When a number has only two possible positions in the same row or column of a 3x3 house, that number cannot be placed in any other position along that row or column.

Math games like Microsoft Sudoku train important brain skills including numerical ability and concentration. Play these games often to give your brain a boost!

Published: 04/18/21
Last Updated: 04/18/21

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