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Samurai Sudoku Rules

A brief guide

This is an example of a finished Samurai Sudoku puzzle. It consists of 5 inter-linked standard Sudoku grids. The four 3x3 regions that appear in two separate grids need to satisfy the rules for both grids at the same time.
The best way to approach a Samurai Sudoku grid is to tackle each sub-Sudoku independently, and only as you get towards the end of the puzzle will you find that you need to take in to account that some cells appear in two Sudoku grids.