![]() ![]() We can put a 2 in H8, a 2 in G5 and a 4 in I6 We can now reiterate the process starting from 1. Row D and column 9 intersect in box 6, indicating that a 7 goes into F8. We can also use scanning to find a few 7's:Ĭolumns 2 and 3 and row C all contain a 7, and they intersect in such a way that the only cell available toplace a 7 in box 1 is A1. We follow the same process to place another '6' in G9, another in H3 and lastly in F2. Looking at the 6's in rows B and C and in column 8, we see that we can safely put a 6 in box 3 in cell A7. Using the same technique used in the previous step, we can place a '6' in C6. Hovering the cursor over the highlighter buttons 4 and 5 we see that there is nothing we can do for now. The same situation we find in box 8, where columns 5 and 6 and row H intersect to leave only cell G4 available for a '3'. However row A already contains a 3 (in A5), therefore C1 is the only cell in box 1 where we can put a 3. Therefore value 3 in box 1 cannot be in columns 3 or 2 but must be in column 1, in A1 or C1. Here we examine the grid vertically searching for single locations in the boxes where we can put the 3's.īox 1 has no 3's but there are 3's in boxes 4 and 7 in columns 3 and 2. Hovering over the 3's, however we some opportunities, so we click on 3 to keep the highlighting. Now, hovering over the highlighter button 2 we also see that there isn't enough 2's on the grid to use this technique. There is nothing else we can do for now to find more 1's. The only empty cell in box 7 row I is I3, therefore we move the cursor over that cell and type '1' on the keyboard. Because box 8 and box 9 already have their 1s (respectively on G6 and H9) the 1 must be in box 7 row I. Therefore the only row where we can add a 1 is row I. This way we can move the cursor around the grid concentrating on 1's.Įxamining box 7 in conjunction with rows G, H and I we notice that 1's appear in row G and in row H but not in row I. This will highlight with a black circle all instances of 1 on the grid (givens and any 1's that you previously entered).Ĭlicking on the highlighter button rather than simply hovering over it allows us to keep the numbers highlighted until we click the button a second time or click on another button. ![]() ![]() Start looking for the 1's by clicking on the highlighter button '1'. We will start using a simple solving technique known as "Scanning". At the beginning we are presented with the grid containing only the givens. You may follow along solving the same puzzle by clicking on this link that will open the same puzzle in a new window (or tab) of your browser. The puzzle we will solve in this tutorial is rated 'very easy' (it was published on the 7th of April,2012). If you are new to sudoku please familiarize yourself with its terminology and rules before continuing this tutorial. Throughout the tutorial we will move around the grid using the mouse and use the keyboard to enter numbers and pencil marks. This tutorial will guide you through the steps required to find a solution to a sudoku puzzle using the player available on this website. ![]()
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