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Sometimes Sudoku puzzles even come with pictures, letters or symbols instead of numbers. Sudoku is a logic game and involves absolutely no math. When Sudoku became a world hit in 2005, it is estimated that it is the biggest phenomenon since the Rubik's Cube in the 1980s.

Needlessly to say, you need a handful of lifetimes to solve all of them. There are 6,670,903,752,021,072,936,960 possible combinations for completing a 9-by-9 Sudoku grid, but only 5,472,730,538 of them really count for different solutions. The game didn't really take off until 2004 though, when Wayne Gould convinced The Times in London to publish it.īritish Airways absolutely forbids its flight attendants from solving Sudoku puzzles during either takeoff or landing. Howard Garns created it as Number Place in 1979 but died in 1989 before Japanese publisher Nikoli got a hold of it. The name 'Sudoku' comes from two Japanese words: 'su', which means 'number,' and doku, which means 'single.' Translated, it mostly means 'single numbers only. This simply means you can savely remove these other candidates. However, this time the cells also have other candidates. This setup is also called Naked Triples.Īgain same logic as the previous strategy. They are distributed in this way: 45, 56, 46. Let's say you have three cells sharing the candidates: 4, 5, and 6. What makes this tricky is that all three numbers need notīe candidates in the same cell. Then for each of the three cells you can remove the same numbers if they are candidates in If three numbers are candidates in three cells inside a row

But as we know that the Naked Pairs must reside in these two cells, we can savelyīuilding on top of the strategy of Hidden Pairs we have Naked Triples which can be a little Now, the cells with Naked Pairs also have otherĬandidates. Just like Naked Pairs but with an extra twist. They are present in the same two cells' column and block. Of numbers in a row can only appear in two cells you can savely remove the same two numbers if Same logic as Hidden Singles but now we are talking about two numbers instead of one. Removed because the Hidden Single must go in this cell.

Same as Naked Singles but the same cell can have other candidates as well but they can be Let it be number 5, then this number (5) must go in that cell. If a cell in a row only can have a single candidate number, The last four strategies are used to eliminate numbers. The first two of the six basic strategies are used to savely determine a number in a given cell. The basic strategies often mention these terms: rows, columns, blocks, and candidates. Possible numbers in a cell are called candidates. This board has rows (A), columns (B), and blocks (C). In this section we'll introduce 6 basic strategies.Ī traditional Sudoku puzzle consists of a board of 9x9 cells as seen in the picture below. You probably already use some strategies without thinking of them as Applying strategies to logic games will help you solve Sudoku puzzles

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