John sent me last week an e-mail about a (for me) new type of Sudoku Puzzle which is published in the paper version of The International Herald Tribune.
Next to the nine grids in normal Sudoku puzzles this Sudoku variant has four extra grids which are shaded. Each of the nine grids and the four shaded grids must contain the numbers 1-9.
For now I will call this Sudoku variant ‘IHT Sudoku’, but looking for the original name. And I am also looking for information on where to find more of this Sudoku variant, as on the IHT website the Sudoku puzzle is the standard one on the New York times site. Thanks for helping and … Happy Puzzling!
UPDATE: Thanks to Otto for helping us out. The Sudoku in the is known as “WinDoku” and “extra region Sudoku”. There is also a Daily Windoku to solve.