Mirrored from Sudopedia, the Free Sudoku Reference Guide
Valid
A valid or proper Sudoku has a unique solution, otherwise it is an invalid Sudoku.
Opinions differ about the use of this qualifier. Some players state that the name Sudoku implies that there is a unique solution. A puzzle with multiple solutions only looks like a Sudoku.
This page was last modified 19:49, 8 November 2007.
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