Loading, please wait...
Loading, please wait...
Planet Sudoku might take a couple extra seconds to load, but it is worth it!

Loading Issues?
Try refreshing our site (CTRL+R), and or clearing your cache.
Still issues? Please email ivan@redbeardsolutions.com.
Register to resume your game on a different computer.
Enables your statistics to be kept forever.
Click to hide the ad.
Larger playing area will be provided by hiding this ad.
 

Sudoku Puzzle Type


PlanetSudoku.com offers the most popular type of Sudoku. PlanetSudoku.com's Sudoku puzzle generation system was built with other types of Sudoku variations in mind including Sudoku X, Alphadoku, Alphadoku X, Killer Sudoku, Killer Sudoku X, and Irregular Sudoku.

Sudoku Puzzle Size


Sudoku puzzle boards can be created in all different sizes. Currently, Planet Sudoku provides the size of 9x9.

One of our objectives to to provide additional Sudoku board sizes such as 3x3, 4x4, 6x6, 8x8, 12x12, 16x16, 20x20, and 25x25.

Sudoku 4x4 Game Design


Sudoku 4x4 puzzles are a great way for learning the base concepts for Sudoku. Valid numbers range from 1 through 4. The logic is the same as the more advanced boards, but just a tad bit easier. This would be a great place to start for kids and beginners.

Sudoku 6x6 Game Design


Sudoku 6x6 puzzles are a little bit more difficult than the Sudoku 4x4 puzzle. Valid numbers range from 1 through 6. Great for kids, beginners, and intermediate Sudoku skill levels.

Sudoku 8x8 Game Design


Looking for something a little bit different than the run of the mills Sudoku 9x9 puzzle? Then the Sudoku 8x8 puzzle might be what you are looking for. Valid numbers range from 1 through 8.

Sudoku 12x12 Game Design


Fun is just starting with the Sudoku 12x12 boards. You will see the introduction of letters to include a unique set of 12 letters and numbers within the Sudoku board. All Sudoku rules still apply.

Sudoku 16x16 Game Design


Sudoku 16x16 puzzles provide a greater challenge to the seasoned Sudoku player. There is a total of 16 valid letters and numbers to make this Sudoku puzzle extra fun.

Sudoku 20x20 Game Design


Sudoku 20x20 puzzles really start relying on letters to solve the puzzle. This is where you really need to concentrate to be able to solve this type of Sudoku puzzle.

Sudoku 25x25 Game Design


Sudoku 25x25 puzzles provide 625 penned and open cells to challenge the most skilled and adventurous Sudoku player. These boards are so hard that my Sudoku board builder has issues pumping out new boards for you to play!

Sudoku Standard Game Design (One Board)


The standard game design for a Sudoku puzzle consists of one board. The actual size of the board will be determined by the Game Size option.

Sudoku Multi 2 Game Design


Sudoku Multi 2 puzzles consist of two boards all joined together on a corner. The boards can be solved individually at a time or at the same time.

Sudoku Multi 4 Game Design


Sudoku Multi 4 puzzles consist of four boards all joined together within the middle. All boards share rows, columns and boxes with two other intersecting boards. The boards can be solved individually at a time or at the same time.

Sudoku Samurai Game Design


Sudoku Samurai puzzles consist of five boards all joined together within the middle. Boards one through four are placed at all four corners, with the fifth board placed in the center. The fifth board shares rows, columns, and boxes with the other intersecting boards. The boards can be solved individually at a time or at the same time.

Sudoku Pen Designs


This feature allows you to choose what type of pen designs you would like to use within selected Sudoku puzzle. We have provided several different options to choose from listed below:

Any Design
Randomly picks Sudoku puzzles of the pen designs listed below.

Randomized
Sudoku penned cells are selected randomly during our Sudoku board generation process. This provides a completely randomized Sudoku penned board.

Criss Cross
Sudoku penned cells are mirrored between four quadrants. For instance, you will see that the top left section of the Sudoku puzzle board will mimic the bottom right.

Vertical
Sudoku penned cells are mirrored from left to right. For instance, the left section of the board will be mirrored to the right.

Horizontal
Sudoku penned cells are mirrored from top to bottom. For instance, the top section of the board will be mirrored to the bottom.

Reflection
Sudoku penned cells are mirrored from the middle of the board to the outside.

Sudoku Puzzle Difficulty


Sudoku puzzle difficulty is determined based on several factors about the individual puzzles. Our system reviews how many open cells there are within the puzzle. Then determines what type and how many logical solving techniques where needed to solve the Sudoku puzzle.

Once that information is gathered, we give the Sudoku puzzle a difficulty score.

Very Easy - Sudoku puzzles that only use the basic solving technique of Naked Single.
Easy - Hidden Single, Naked Pair, and / or Hidden Pair.
Medium - Naked Triple, Naked Quad, Hidden Triple, and / or Hidden Quad.
Hard - Naked Quint, Hidden Quint, Pointing Pair, Pointing Triple, and / or Box Line Reduction.
Very Hard - Jelly-Fish, X-Wing, and / or Sword-Fish.
 

Google Chrome is much faster viewing web sites.

Start playing Planet Sudoku as an expert using Google Chrome today.
Planet Sudoku - Millions of Free Sudoku Puzzles Online and Printable
Open Cells: 81
Puzzle #
 
Puzzle Infohide
Very Easy 16x16
Times Played:
Open Cells:
Puzzle Score:
Puzzle Type: Sudoku
Puzzle Size:
Puzzle Design:
Pen Design:
Difficulty:
 
Solving Technique Count
Naked Single:
Hidden Single:
Naked Pair:
Naked Triple:
Naked Quad:
Naked Quint:
Hidden Pair:
Hidden Triple:
Hidden Quad:
Hidden Quint:
Pointing Pair & 3:
Box Line:
X-Wing:
Sword-Fish:
Jelly-Fish:
Squirmbag:
Hints \ Candidates
'Hide Ad'

New Sudoku Puzzle
 
 
 
* this will force all devices using your saved credentials on Planet Sudoku to re-login.
Your Sudoku puzzle has been saved successfully on Planet Sudoku.
Are you sure you want to reset your Planet Sudoku statistics? This action cannot be undone.
Are you sure you want to start a new Sudoku puzzle? All progress will be lost.
Are you sure you want to restart your Sudoku puzzle? All progress will be lost.
Last time we saw you , you were in the middle of another Sudoku puzzle. Do you wish to continue that game now or abandon it?
Score:
Score With Bonus:
Time:
Moves:
Hints Provided:
Puzzle Verified:
 
Please Tell a Friend about Planet Sudoku
* don't forget to like us in the bottom right...
Your Sudoku puzzle is currently invalid.

Please review cells with conflicting pencil marks or without valid hints.
Your Sudoku puzzle is valid.
Are you sure you want to start a new game? All progress will be lost.

Numeric characters only
Max # of