The key to solving Sohei Sudoku is to remember that the standard Sudoku rules apply to each individual grid within the combination.
Where grids overlap the numbers placed in the squares within the overlap, must be valid for each grid that shares those squares.
By using logic and deduction, you must work through each sudoku grid, and how it relates to the other grids, to find the one and only solution.
Named for the warrior monks of medieval Japan, Sohei Sudoku has four merged grids. Each grid has two overlapping areas.
Sohei Sudoku takes the classic Sudoku challenge and amplifies it by combining multiple grids, requiring a higher level of strategic thinking.