![]() ![]() In case there are three cells in a house (which means row, column or box) which have three same candidates, you can eliminate those 3 from all other cells in that particular house. If you take a look at R8C7 or R8C8, both are in the same row and they have just two candidates each. The pencil marks for row #8 are marked here. In case there are two cells in a house, column, row or box that have just two candidates, you can eliminate these two candidates from all other cells in that house. If in a column or row, all candidates of a specific digit, let’s assume two this time are in only one box, you can eliminate that digit, i.e., two from all other cells in that box. Look at this example to understand this better.Īs you might have guessed, this method is opposite of type 1. You should remember that if in a box, all the candidates of a specific digit, let’s assume one is confined to just one column or row, that digit, i.e., one cannot appear outside of the box in the same column or row. A shortcut is to press Alt, and the number you are seeking like alt + 5 will highlight the number everywhere. In live sudoku, you will have the highlighted menu available on every puzzle, and you are free to click on any digit between 1 to 9 with the mouse to highlight it within the puzzle. Highlighting is a tool that you can use for identifying complicated and simple steps. Why don’t you fill in the pencil marks for R5C5? To start, it can be any digit between '1' and '9'. You sometimes do it for more than one cell, and you keep the candidates written within the cell itself. You can track possible values for a cell by using pencil marks. Look R5C8 in this sudoku puzzle and see for yourself that the buddy cells are highlighted in grey color. Have a look at the marked box on this Sudoku and try to see which cells could contain digit one in that particular house.īuddy cells are cells that are in the same box, row or column. ![]() This term means that there is just one possible cell for a digit in a specific house and the digit is hidden among other possible digits that can be put in that cell. Please look at box #7 highlighted in Sudoku. The basic rule of this game is that each column, row, and box must contain all digits from 1 to 9 and each of the digits can appear just once. Sudoku is one of the most popular games that challenge your mind and helps sharpen it. ![]()
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