Each link gives you two puzzles on the same page. Simply click the clearly labeled links to see the puzzles and their solutions.
Sudoku for beginners free#
They have hundreds of free printable Sudoku puzzles in Easy, Medium, and Hard categories. Puzzles.ca is a website with a variety of free online and printable puzzles and games. Get hundreds of free printable Sudoku puzzles Here’s an example of a traditional Sudoku puzzle: In fact, it’s possible to make and solve a Sudoku puzzle with letters, colors, or other symbols. Numbers are only used because they’re well-recognized symbols. It’s logic-based and doesn’t require any math. Many of these easy techniques will be the subject of the next few blog pages.Sudoku is a number puzzle – you can think of it a little like a crossword puzzle, except that it uses numbers. Proof writing without such an aid would be almost prohibitively difficult.Įspecially when one is filling in a puzzle by hand, much time can sometimes be saved by using some of the easy techniques. A program such as Simple Sudoku is also a tremendous help in documenting the steps that I take. Therefor, when tackling difficult puzzles, I use a program - Simple Sudoku - to fill in the possibility matrix (see Sudoku Tips Introduction). My handwriting is absurdly messy and often illegible. I prefer the latter, because of linguistic symmetry with the 'Possibility Matrix'. Initially, the 'UP' shorthand meant either 'Unique Placements' or 'Unique Possibilities'. This ambiguity caused some confusion in the proof writing.
It evolved because the former term, 'Easy Fillings', was used for cell fillings that were the result of both 'Unique possibilities' and easy non-native eliminations (easy techniques). I believe that the term 'Unique Possibilities' was coined at this site through the suggestion of DJ from AZ. I remember that the first puzzles that I tackled were completed using only 'Unique Possibilities'. Hopefully, the tips will progress rapidly towards the more interesting.įor beginners, though. This page is part of the base towards eventually getting to the more complex tips. Use of only these techniques will not solve "hard" or "tough" puzzles, but generally will solve Finally, b2 cannotīe 3457 becauase box b2 already contains 3457. B2 cannot be 1245 because row 2 already contains 1245. In this case, one could say that cell b2=8 because it cannot be 369 because column bĪlready contains 369. They intersect at the cell highlighted in yellow. They are one of each of the numbers:ġ,2,3,4,5,6,7,9 - but not 8. But since e1=4, e8=5, e9=3 are givens, the only remaining location forĨ in row e is e7, highlighted in orange-yellow.Ībove, note the cells highlighted in blue.
Because of the three given 8's, onlyĮ1,e7,e8,e9 could be 8. Since e1 is already 4, the cell highlighted in pink,ĭ1, must be 8. Thus in box e2, only d1 and e1 could be 8. That cannot now be eight because of the rules preventing two eights in any large container. The cells highlighted in blue are the cells These are highlighted in green at cells a2, f6, g3. Singletons in a large container, or a small container (cell), is labeled asĪbove, note that at the inception of the tough puzzle from 11/30/06, three eights were given. In proofs that are commonly presented at, this process of finding Find below some simple examples of this technique.
In a similar fashion, if a cell cannot be all but one of the candidates, that it must equal To find where a candidate cannot be placed, and if there is only one location for a particularĬandidate in any row column or box (large containers), then that cell is solved.
Using these rules with a "one pass" approach. All tips involve merely applying the rules of Sudoku.
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