I have presented the trio a Multi Sudoku of 3 Sudoku (Multi Sudoku with 3 Sudoku : The trio ) . Now I present you the Quatro, a Multi Sudoku with 4 Sudoku. The Sudoku could be interlaced in many ways giving many possible arrangements. First each Sudoku shares one region (box of 3x3) with two other Sudoku.
The printable files PDF
Puzzle : quad_a00001.pdf
Solution : quad_a00001_sol.pdf
Or each Sudoku shares 2 regions with two other Sudoku.
The printable files PDF
Puzzle : quad_00017.pdf
Solution : quad_00017_sol.pdf
Or each Sudoku shares a varable number of region with two or three other Sudoku.
The printable files PDF
Puzzle : quad_00001.pdf
Solution : quad_00001_sol.pdf
Enjoy !!
Dont forget you can find these puzzle in my book Spectacular Sudoku Variant 1 Spectacular Sudoku Variant 1
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