Sudoku

Currently 106 Players Online Playing This Game!

Genres

Features

  • WSOP Poker

    Play nine varieties of poker and compete in free online tournaments.

  • Solitaire

    Play you favorite solitaire games including Spider, Pyramid, TriPeaks and FreeCell.

  • Blackjack

    Blackjack tournaments, tips and videos.

  • Games for Kids

    Play 100+ games for FREE including Batman: Mystery of the Batwoman and Booger Bowling.

  • Games.com News and Community

    Get messages from the Games.com team and interact with other players. New and Improved!

  • Games.com Tool Bar

    Free Games right in your toolbar. You'll always be one click away from Games.com

  • Free Mobile Games

    Play great classic board games, casino games or multiplayer games right on your cell phone!

    Your system does not meet the online requirements. Click Help for more...

    hitting play will launch new window

    Game Description

    Sudoku is a simple, addictive game of logic that will leave you begging for mercy! Solve the mystery of the number grid with reasoning and patience (no math required). There is only one rule: Fill in the grid so that every row, column and 3x3 box contains all digits 1-9 only once. Let the brain teasing begin!

    Features:
    * Ten Degrees of Difficulty
    * Global & Personal High Scores
    * Print Games and Play with a Pen and Paper
    * Play Offline & Full Screen

    Game Tips for Sudoku

    • (1) a) Check each horizontal set of three 3x3 boxes. If exactly two of the 3x3 boxes in a horizontal set contain the same number, then it is often easy to figure out where that number goes in the third box (by simple process of elimination). b) Do the equivalent trick for each vertical set of 3x3 boxes. c) If any squares have been filled in step 1b, go back to step 1a and repeat. If not, go to step 1d. d) Go the row, column, or 3x3 box that has the most squares filled in and see whether any of the "missing" numbers/squares can be filled in. Do the same for other rows, columns, 3x3 boxes that have many squares filled in as well. e) If any squares have been filled in step 1d, go back to step 1a and repeat. If not, go to step 2.
    • (2) At this point take a light pencil and for every unfilled square, write in all the numbers that could possibly go in that square. (I use the corners of the square to put the numbers in a small size.) You have to be *very careful* doing this step. Each unfilled square must have written in it (in pencil) each number that has NOT currently been eliminated for that square. The goal from here is, through a few logic steps, to eliminate these written possibilities until squares that only have one possibility are left.
    • (3) Check each row, column and 3x3 box for a match which is a combination of N unfilled squares that have between them only N possible number values. For example, if you have two unfilled squares in a row, both of whose only possible values were 4&6, then you've got a match. Another example: if you've got three unfilled squares in a 3x3 box which contain just the possible values 2&7&9, 2&9, and 7&9 respectively, then you've got a match. When you have a match, every other unfilled square in that particular row, column or 3x3 box can have the numbers you found in the matched boxes eliminated (by erasing). For example, in the first example above, if another square in the candidate row has possible values 2&4&8, then you erase the 4 from that box, leaving 2&8. [Important note: If the match you find is *simultaneously* in a 3x3 box as well as in a row or column, then you can perform the elimination step on *both* structures.]
    • (4) Once you've found a match and done the appropriate elimination(s) from other boxes, *if* you've gotten to the point where an unfilled box now has only one remaining possibility, fill in that number in pen (in a similar character size to the pre-filled numbers). Go to step 3 and repeat. [Hint: it is often quicker to examine the rows, columns and 3x3 boxes that have been affected by recent possibility eliminations. You are more likely to find another match there.]
    • (5) Most puzzles can be completely solved by applying steps 3 & 4 over and over again. However, I have found that occasionally you need a further step that is a variant on step 3. Check each row, column and 3x3 box for a match which is a combination of n unfilled squares that share between them n number values where those n numbers are *not found anywhere else* in that particular row, column or 3x3 box. For example, if you have a column with 5 unfilled boxes whose possible values are 2&3&4, 2&6&9, 6&9, 3&4&6&9, 2&6&9, then you've got a match on the first and fourth square, both of which have 3&4 and those two numbers are not found anywhere else in that column. When you get a match like this you can eliminate *from the matching squares* any other possible values. (In this case, you'd end up with: 3&4, 2&6&9, 6&9, 3&4, 2&6&9.) Go to step 4.
    Post A Review

    Game Reviews

    Having an issue with the game?
    Let us help you fix it. Click the help button for more...

    bmangolfer9
    2008-10-06 3:28:09 pm GMT
    the simplest way to track possible number combinations!
    vfab123
    2008-09-18 10:35:27 pm GMT
    takes too long to test for results......makes me loose interest
    Showing 1 - 2 of 2

    Post Your Own Review

    500 character maximumNote: You may only rate a game once.

    Having an issue with the game?
    Let us help you fix it. Click the help button for more...

    New Games Gallery

    Play Video Poker, Win Stamps

    Video Poker

    Video Poker just got a whole lot more fun. Draw and win stamps. It's fake money, so go totally Poker-crazy.

    1. Click Here to Play Free Video Poker
    2. Now With Dares and Stamps

      Games.com Top 11 Games

      Recently Played

      You have not played any games with us. Once you do they'll be stored here for quick access next time you visit.

      Games.com Newsletter

      Sign-up for the Games.com Newsletter
      The latest game news delivered to you FREE every two weeks:

      • Find out about new games first.
      • Keep up to date on the latest Stamps for your profile.
      • See a complete list of tournaments and events.
      • Get insider tips to improve your game.

      Enter your e-mail address:
      We do not sell our newsletter list to third parties.