The puzzle was refined and took its modern form in the United States in the later part of the 20th century, and became a world-wide phenomena after computer generated Sudoku puzzles became common around 2004. Sudoku puzzles, in spite of their Japanese sounding name, was originally developed for publication in French newspapers in the late 19th century as a variation of more common magic number puzzles. This slightly non-deterministic approach to problem solving is one of the characteristics of sudoku puzzles that makes solving them so addictive. There are many more complex strategies for eliminating potential numbers, but most strategies rely on these simple means of exclusion and thinking one or two steps ahead in the search to see if the solution fits. This sort of mutual exclusion is a powerful way to filter out possible values in your solution, and with a little practice you can apply it with rows, columns and squares. If that column already has a 5 in it, you know the value that goes in the blank position MUST be 6 because putting a 5 there would violate one of the sudoku rules. However, you could look at the column that intersects one of the blank positions in the row. If that’s all the information you have, you have little to do except guess. Consider a row that is missing digits 5 and 6.
#Online color sudoku how to
Where sudoku puzzles get challenging is when there are multiple open positions in a row or column… In these cases you may need to look at more than one part of the puzzle to figure out how to solve the puzzle. This same strategy of finding missing digits easily extends to rows or squares. For example, if eight out of nine positions in a sudoku column already have a value, the nine position must contain the digit not already mentioned in the column. When there are many numbers supplied, it is easier to figure out which numbers can be put into a specific place in the puzzle. Suduko puzzles typically get more challenging depending on how many numbers are supplied in the initial puzzle. These three constraints, that a digit not occur more than once in a row, column or square, make up the basic rules of sudoku. Additionally, you’ll notice the sudoku grid is divided into 9 squares, each 3x3, and a digit can also only occur within these squares. The numbers must meet certain criteria, specifically that the same digit cannot occur more than once in any column or more than once in any row. The grid starts out with some positions populated and your job is to fill in the remainder. While the app may not be able to solve every 'hard' and 'evil' puzzle automatically, it can assist in whittling down the puzzle for your continuing challenge.Sudoku is a type of logic puzzle that requires you to fill in digits on a 9x9 grid. There is an option to automate the solving of generated puzzles, and a slider control for changing the speed of the automatic solution. It will also reveal the hidden 'naked pairs' within the notations, and show if there are any unique numbers among the notation's rows, columns, and biscuits. The app will indicate through the use of colors where a selected number might belong. For an added challenge, you can also use flowers, butterflies, Monopoly pieces, and American Sign Language tile sets.
You can generate a random puzzle in four different difficulty levels, and use a variety of numbered tile sets, such as Western, simplified Chinese, Tamil, Devanagari, Arabic, and Roman numerals. The 'Sudoku Solver With Colors' app is designed for both learning the basic rules for Sudoku as well as for solving puzzles, simply through the use of colors!