Sudoku is a game where logic is at its forefront. You shouldn't have to guess when playing sudoku. Be patient, recognise patterns and have a clear mind to play your best game.

Sudoku is a brain challenging number game, played on a 9x9 sudoku board. The sudoku board is broken down into nine 3x3 squares. The object of the sudoku game is simple. Every row, column, and 3x3 box in the sudoku board must contain the digits 1 through 9 only once! As the difficulty progresses, the sudoku game becomes harder, and you'll have to employ more advanced and strategic logic to solve the puzzles. If the current index is assigned then call the recursive function with the index of the next element, i.e. i, j+1 Sudoku is played on a grid of 9 x 9 spaces. Within the rows and columns are 9 “squares” (made up of 3 x 3 spaces). Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square. Does it sound complicated? As you can see from the image below of an actual Sudoku grid, each Sudoku grid comes with a few spaces already filled in; the more spaces filled in, the easier the game – the more difficult Sudoku puzzles have very few spaces that are already filled in. If you want to know how to play sudoku then you've come to the right place. Our step-by-step guide will help you learn how to solve any sudoku. What do we mean by using “process of elimination” to play Sudoku? Here is an example. In this Sudoku grid (shown below), the far left-hand vertical column (circled in Blue) is missing only a few numbers: 1, 5 and 6.For example, in the upper left square, we know we need to add a 5 and a 6 to be able to complete the square, but based on the neighboring rows and squares we cannot clearly deduce which number to add in which space. This means that we should ignore the upper left square for now, and try to fill in spaces in some other areas of the grid instead.

As you can see, in the upper left square (circled in blue), this square already has 7 out of the 9 spaces filled in. The only numbers missing from the square are 5 and 6. By seeing which numbers are missing from each square, row, or column, we can use process of elimination and deductive reasoning to decide which numbers need to go in each blank space.Sudoku is played across a grid of 9 x 9 spaces, and amongst the rows and columns, are 9 separate ' squares' (each made up of 3 x 3 spaces). Time complexity: O(9 (N*N)), For every unassigned index, there are 9 possible options so the time complexity is O(9 If you’ve never played sudoku before, these rules will still probably be sounding pretty alien to you. Continue reading for our full sudoku rules for beginners. Why play sudoku? The other base case is when the value of column is N, i.e j = N, then move to next row, i.e. i++ and j = 0.

Top tip: No number can be repeated in any 3×3 box, row, or column! And the goal is to fill each 9 square row, each 9 square column and each 9 square box with the numbers 1 to 9 only, with each number used once and only once in each section. 3. Do NOT guessThere are a total of 81 spaces across the entire sudoku 'board', and each space will ultimately be filled with a number between 1 and 9. Typically, a new sudoku board will already have some spaces filled in with numbers, and based on how difficult the puzzle is, the board will feature less numbers and indicators that hint at what the answer is. 2. Know the basic rules You must not repeat the same number within the same row, column or square. (So, only the numbers 1-9 can be used just once). Follow these five rules and you should be able to solve any sudoku puzzle! There are different levels of difficulty when it comes to sudoku, so if you find yourself struggling to complete the puzzle don’t be too hard on yourself, you may just be trying to solve a real tough one.