Free Online Sudoku Levels include kids, easy, medium, hard, and evil Solve the free online sudoku puzzle by filling in the empty cells with a single number (from all the possible candidates) that doesn’t violate  Sudoku rules. There is only one correct number per cell. Scan the “givens” looking for the same number in different rows, columns, or regions. Eliminate cells for consideration by applying the Sudoku rules using these numbers. In cases where the solution isn’t immediately obvious, you markup or pencil in a vacant cell the possible candidates for future reference ..read more

It is a 12×12 Sudoku puzzle with a twist. Here is the scoop. A typical 12×12 Sudoku puzzle puts the numbers 1 through 9 plus A,B,C in every row, column, and 4×3 box. Stars & Stripes adds a new wrinkle. Instead of using letters A, B,and C, the puzzle uses three stars in the form of an asterisk (*). The difference is the 3 stars (*) are the “same”. Each row, column, and 4×3 box will contain three stars in a finished puzzle. When I solved a sample online game on www.sudoku-usa.net, I found it easier to solve for all the numbers. The remaining open cells had to be stars. Likewise if y ..read more

Fiendish Sudoku – 200 Challenging Sudoku Puzzles has 200 very difficult printable puzzles that you can download today. This eBook is not for beginners. I’ll bet you can’t solve these fiendish Sudoku puzzles, at least not very quickly. Fiendish Sudoku 200 Challenging Sudoku Puzzles – Download Book Rated 0 out of 5 $9.90 Add to cart Don’t be deceived, not all puzzles that claim to be fiendish are difficult. I once had a visitor to this website who didn’t think the evil puzzles in her newspaper were very difficult. They weren’t. The puzzle she sent me didn’t have any patterns harde ..read more

Home Sudoku Puzzle Solver Algorithm-Driven Program and Computer There are several good puzzle solvers online and available, but most of them implement only a few solution-seeking algorithms and then fall back on a ‘brute force’ method. I wanted to see if I could create a solver program that approached puzzles the way a human being would, using multiple algorithms. Frankly, when I started the programming… I did not realize that there was much beyond naked and hidden singles and thought I would be done with the effort pretty quickly. Only after trying my initial attempts at more complex an ..read more

Lots of tips from our readers on solving sudoku... Sudoku Solver Program Sudoku Puzzle Solver Algorithm-Driven Program and Computer There are several good puzzle solvers online and available, but most of them implement only a few solution-seeking algorithms and then fall back Read sudoku page » Sudoku Match – The platform for Sudoku mashup games by Brad Smith Sudoku Match Vol. 1 The Black series is a mashup of Sudoku and Word search. Complete the Sudoku grid to find the solution row or column. Use Read sudoku page » Math by Rick Yakubisin(Greensburg, PA) Any row, column or grid. Pick a ..read more

by Ed GLysson (Morgan Hill, CA) Sudoku Puzzle — Boxout Pattern A true Sudoku Puzzle must be resolvable to only one solution. A Boxout Pattern is a Sudoku Puzzle condition to be avoided as it results in the possibility of two solutions. A Boxout Pattern is generally only observed in the more challenging Sudoku Puzzles. First let’s examine the attachment “Sudoku Puzzle – Boxout Fragment”. Observe the Space entries that can only possibly contain a 1 or a 9. These are 15, 16, 78, and 79. (Refer to my other article “Sudoku Square and Space Notation” for a description on how ..read more

It is hard to explain. A Sudoku puzzle is addictive! My wife and I just love to solve them. Apparently we aren’t alone. The demand is growing. What is it about Sudoku? When I get done solving one, I just want to solve another puzzle. And another, and another… For those that don’t know, Sudoku (or Su Doku as some prefer) is an addictive puzzle created in America, popularized by the Japanese, and spread throughout the whole world. A classic Sudoku puzzle is made up of nine rows and nine columns of numbers. These rows and columns make up nine mini-grids surrounded by a border. See the fig ..read more

“Sudoku Easy To Very Hard 105 Addictive Sudoku Puzzles” is ready for you to download and solve. It will give you hours of brain teasing fun! Once you start solving these Sudoku puzzles, it is hard to stop. Sudoku Easy To Very Hard 105 Addictive Sudoku Puzzles – Download Book Rated 0 out of 5 $4.99 Add to cart I have handcrafted and accurately graded each Sudoku puzzle in this eBook for you. My first Sudoku ebook is comprised of a selection of puzzles for every skill level. You will find 20 Easy puzzles 40 Medium puzzles 30 Hard puzzles 15 Very Hard puzzles You will have two 3 ..read more

by Brad Smith Sudoku Match Vol. 1 The Black series is a mashup of Sudoku and Word search. Complete the Sudoku grid to find the solution row or column. Use the solution key to find the Solution Match word. Solve all the Sudoku and Solution matches in a section and collect the solution words to solve the Master Match. Fun and challenging. The Sudoku Match platform brings a new level of interaction and excitement to the Sudoku game. Challenge yourself with the number Logic of Sudoku and test yourself with the word search — in 1 place The post Sudoku Match – The platform for Sudoku ma ..read more

by Rick Yakubisin (Greensburg, PA) Any row, column or grid. Pick a candidate and count how many the chosen candidate is in the row, column or grid. Count the cells that are filled in for the row, column, or grid.  Add the two counts together.  Subtract from nine. If the number of integers in the remaining cells is less than or equal to the calculation then there is a hidden pair, triplet, or quad.  Of course, if they are not hidden it’s not of value. 1) If you look at row candidate 6 in row 6 you get a count of 3 2) There are 2 completed cells(3,9) in row 6 for a co ..read more