![]() ![]() ![]() If you know the rules of sandwich sudoku but aren't sure how best to tackle a puzzle, this video walks through a puzzle and how to solve it to get you started. Read more Puzzle Strategy Tips on a range of different puzzle types. Why not now purchase a sudoku plus puzzle magazine now and enjoy 100 all new puzzles. Therefore we can place pencilmarks for 7,8,9 in the middle three cells of the final column, and eliminate them from the rest of the column and the sixth 3x3 box at the middle-right of the puzzle.Īnd that's how to solve our sudoku plus (or outside sudoku puzzles). Now the only way to do that is with 7,8,9. Therefore the central three cells must sum to 45 - 21 = 24. The first three cells sum to 8 and the final three cells sum to 13. We can use the rule of 45 of course in sudoku plus puzzles, and sometimes with the harder puzzles in sudoku plus magazine you will need to do that.įor instance, look at column nine. The more you solve the more you can start to use the standard sudoku rules such as working out the value that must be in a cell based on eliminating other numbers in the row/column/box, and seeing if there is only one cell in a region that could contain a particular number.Īs for advanced sudoku plus solving strategies, well any advanced sudoku or killer strategy can be used. If there are no regions with just one option, then look for those that have very few options and start to mark in the pencilmarks to reduce the options gradually.Īs you work through in this manner gradually reducing the options for cells, you will be able to start placing values straight away. So mark those pencilmarks in those three cells, and remember that we've also eliminated them as options in the rest of column 7 and also the third 3x3 box. So we know that the three cells beneath it must be '6,8,9' in some order or other. That is look for combinations that only have one option at the start, then place those pencilmarks and eliminate as options from the rest of the region.Īs an example, you can see that there is a '23' at the top of column 7. Solving strategies are therefore essentially the same as with killer sudoku, or addoku. As such you can visualise the puzzle as a partial killer sudoku. And this is because around the outside a number is given, which corresponds to the sum total of the first three cells in a row or column. The grid is that of a normal sudoku: nine rows, nine columns, nine 3x3 boxes. What is interesting about sudoku plus (which is also called outside sudoku in some places, but we avoid that name as it can also refer to another variant too!) is that it combines elements of sudoku with elements of kakuro, or killer sudoku. There are literally hundreds of variants of sudoku puzzles. If you've just bought Sudoku Plus magazine, then you might be wondering how to solve the puzzles that the sudoku plus magazine has to offer! ![]()
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