Sudoku puzzles explore an interesting area of math called combinatorics and there are various contemporary research papers written about the complexity and solvability of sudoko problems with different characteristics. 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.
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. Its simplicity and engaging levels make it a great puzzle game even for complete beginners.Sudoku is a type of logic puzzle that requires you to fill in digits on a 9x9 grid. In easy Killer Sudoku levels there will be a lot of cages like this, so look closely and this strategy will certainly pay off! Who can play Killer Sudoku?Įveryone! Easy Killer Sudoku is a great gateway puzzle for those of you unfamiliar with the number games but curious where to get started. For instance, if you see a two-cell cage equal to 10, with 6 already in place – be sure the other one is 4.
The very first thing you should always do is to check the grid for the partially filled cages. Numbers inside a cage, when added together, should make a number shown in the upper left corner of that cage.Įasy Killer Sudoku strategy for beginners.
Easy Killer Sudoku online levels offer more numbers already placed from the startĭon’t repeat the same number within a row, column, 3x3 block or “a cage”, indicated by a dotted line. Fill the grid with numbers from 1 to 9.Killer Sudoku rules are quite simple and intuitive and do not require any special knowledge or skills.This makes easy Killer Sudoku puzzles an incredible fit for beginners. In many cases Killer Sudoku is much easier and more fun to play than its fellow puzzle – the classic Sudoku. Even though the word “killer” in its name implies some sort of insane difficulty, don’t let it scare you off. Killer Sudoku is one of the hottest logic puzzles these days.