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Sudoku-DG

Sudoku-DG (also known as Offset Sudoku) is one of the Sudoku Variations with additional constraints. DG refers to the 9 disjoint groups in the puzzle, one for each relative box position.

Here is an example:

The 9 disjoint groups each have a distinct color. Each group of 9 cells with the same color must also contain digits 1 through 9.

The additional groups can be used in the following standard solving techniques:

• Hidden Single
• Locked Candidates
• Naked Subset
• Hidden Subset
• Coloring
• Chains and Loops
• Almost Locked Set

The extra groups will also allow you to search for additional fish patterns. However, no research has been done yet into possible fish patterns for Sudoku-DG.

Minimum Number of Givens

It is possible to have a valid Sudoku-DG with only 12 givens, however it is unknown whether this is the minimum number. Examples of such puzzles can be found in this forum post.

This page was last modified 11:15, 21 December 2007.  

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