You’ll discover a few cool things while solving it, especially on the left side.
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In a nonconsecutive sudoku, adjacent numbers (horizontally or vertically) cannot be consecutive.
Let’s take a look at an example:
Let’s look at B5 (the middle box), and consider where the number 5 might be:
The same method can be used to place the number 4 in B2 (the top middle box).
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This is an extension of consecutive sudoku.
In normal X-sudoku puzzles the two diagonals are marked with a thin, gray line. (They might also be shaded, but that’s less common.)
The lines signify that the sudoku rule of no repeated number also goes for the diagonals.
Some puzzles might have more than two lines. The rule is the same: No number can be repeated in any of the diagonals.
“Greater than” sudoku have no givens. Instead, there are “greater than” symbols to help you deduce where the different numbers must be.
Consider R5C8 in this example: If we follow the “greater than” symbols from cell to cell, we see that all the other numbers in the same box must be bigger. Thus, R5C8 must be 1.
A double sudoku is made up of two standard sudoku puzzles overlapping. Each of them cannot be solved on its own; you have to use clues from one puzzle to solve the other, and vice versa.
Killer sudoku, also called sum sudoku, have no given numbers. Instead, there are sum cages—extra boxes with numbers that are the sums of the numbers inside those boxes.
Like the normal sudoku rows, columns and boxes, no number can be repeated in the sum cages.
Example: The cage sum 4 can only be the sum of 1+3, not 2+2. A cage of three cells with the sum 6 can only be 1+2+3, not 1+1+4.
Killer sudoku is a SudokuMix favorite. There are many different solving techniques to discover, and the puzzles are often very satisfying to solve.