Today it’s Pi Day,a holiday commemorating the mathematical constant ? (pi). Pi Day is celebrated on March 14 (or 3/14 in month/day date format), since 3, 1 and 4 are the three most significant digits of ? in the decimal form.

Pi Sudoku is a Sudoku originally created for Pi Day. To solve Pi Sudoku follow the following rules: Fill in the grid so that each row, column, and jigsaw region contains 1-9 exactly once and ? three times.

Another way to celebrate Pi Day is to take the Pi Day Challenge [Read More...]

Octo Puzzles are a combination between Sudoku and Kakuro and comes in Octo Puzzle Books by Doug Gardner

The goal of an Octo puzzle is to place the numbers 1 to 8 in each of the octagons such that the numbers are not repeated in any octagon, row, column, or diagonal. As clues, you get the numbers in the triangles at the beginning and end of the shorter diagonals, which are the sum of the four or six numbers in that diagonal. The number in the diamond is a different clue–it’s the sum of the four numbers that [Read More...]

Sudoku Unbound #1 is a collection of one hundred, fun, elegant, carefully crafted Sudoku puzzles for your Kindle Reading Device by Puzzazz.

This Sudoku Unbound puzzle collection gives you a great solving experience right on the page. Of course, you can use in-cell notes as you solve, just like you do on paper. If you’re having trouble, move on to a different puzzle – you can always turn back to that page later. Or, get a hint and keep going.

You’ll be both challenged and delighted with this book of puzzles that fit your personal skill [Read More...]

Tri-doku is the new Sudoku variant—and it’s no square. These fun and extra-challenging puzzles come in triangles, all color-coded to indicate special spaces where numbers can’t repeat and where new rules of play come into action.

Each large triangle includes nine smaller ones (just as the square grids feature interior boxes); as usual, you must place numbers one to nine in each triangle. But then solvers face some unique (and exciting) requirements for filling in the edges, for completing the “three legs” of the inner shaded triangle, and for handling the hexagon shapes.

Almost two years after Sudoku Grab for iPhone Google has its own version for Android and iPhone for our favorite daily puzzle distraction

Now, Goggles on Android and iPhone (originally an App to use pictures to search the web) can recognize puzzles and provide answers to help make you faster than a Sudoku champ. So if you ever get stuck, take a clear picture of the entire puzzle with Goggles and we’ll tell you the correct solution. Check out this video to see how it works.

Color Sudoku is a lovely online Sudoku variant with nine colors in stead of the regular nine numbers.

Object is to color the boxes so that each row, column and each of the nine sub grids contains one box of every color. To color a box, click on the box and then click the desired color from the palette in the upper right. Happy Puzzling!

Tags: Sudoku | Puzzle Game

Original Sudoku Calendar 2011 from Nikoli, the Japanese puzzle publisher who launched the Sudoku craze, comes the gold standard Sudoku calendar.

Each sudoku puzzle is hand-created, giving it an interactive feel that computer-generated puzzles can’t match. The sudoku puzzles, printed in full color, begin easy on the weekend and grow more difficult over the week. Happy Puzzling!

Tags: Sudoku