Difference between revisions of "Butterfly"

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(Created page with "'''Butterfly''' is a dense gattai with only 4 overlapping Sudoku grids, with 12 overlapping boxes, 4 of them overlap 4 times! Only 4 boxes do not overlap. It...")
 
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Latest revision as of 03:41, 20 January 2022

Butterfly is a dense gattai with only 4 overlapping Sudoku grids, with 12 overlapping boxes, 4 of them overlap 4 times! Only 4 boxes do not overlap.

It it not possible to generate a valid puzzle without placing givens in the overlapping boxes.

Example

Butterfly-example.png

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