Welcome to this extraordinary book of sudoku variant puzzles known as CLUELESS Sudoku
This is a book for experienced sudoku solvers. It contains a variant of sudoku puzzles which consists of 9+1 sudoku grids. The 9 grids are laid out next to each other, forming a 3 by 3 matrix of Sudoku grids. At first glance, it might look like there are just 9 separate sudoku puzzles there, but that's not true
There is also a 10th sudoku grid - hidden among...
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