The logic behind this move is that in order for every row, column, and block to have the numbers 1-9, absolutely no row, column, or block can hold the same number twice, so by visualizing lines off of every single instance of a number, you effectively show yourself all the places a number can't go. Take care to not fill in the middle 2 blocks however, they both already have an 8 and the puzzle would be wrong at that point.
In my example given I drew the lines off of every 8 on the board and in the upper right block there is a single cell that does not cross any of them, so that block has to be an 8. When you do, you would know that you can fill in that cell with a 1 this can be done with any number. An easier way to think of this is find all of the 1's on the board, draw mental lines vertically and horizontally off all of them, then see if you can find any blocks where all but one cell is either crossing these lines or filled by other large numbers. Look for single cells within the blocks that do not intersect any horizontal or vertical lines that could be drawn from one of the numbers on the board, then place that number when you find them. I like to enjoy myself while solving them, so the steps may seem a bit inefficient as i voice my own standards. on each trick I will first explain what to do, then show how it works in the example image, and finally the logic behind why it works.Ĥ. the pairs/triples/quads will be together but it may be more conducive to move onto the later tricks before thinking in quads.)ģ. each trick will be given *'s for how annoying I think they are to find and use, but they will be ordered by similarity (ie. I use 4 terms regularly, a block is the 3x3 area of squares separated by the thicker lines, a row is the horizontal line of numbers, a column is the vertical line of numbers, and a cell is any individual square on the board.Ģ. The last thing for this introduction will be my order of doing things:ġ. Most sudoku puzzles are made so that there is only one final solution after sifting through all the options and filling in all the blocks. The object of the puzzle is to figure out the places where you have to place the numbers 1-9 in order to have every single row, column, and block filled up with a 1, 2, 3, 4, 5, 6, 7, 8, and a 9. where after every 3 there is a thicker line and throughout the puzzle various numbers are placed. **For beginners** let's get to know the puzzle itself, a sudoku puzzle is a grid of 9 small squares horizontally by 9 small squares vertically.
SUDOKU TIPS FOR BEGINNERS FREE
Each step in this instructable will be of a different trick so if you come across any you already know of then feel free to skip ahead to the later ones. In this guide I will explain all of the tricks I have found to reduce the possibilities in a sudoku puzzle and ultimately solve it.
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