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This content seems to refer to a unique and intriguing concept in the realm of Sudoku puzzles - a Sudoku with no digits at all. Traditionally, Sudoku involves solving a 9x9 grid using numbers 1-9. However, this concept challenges the norm by suggesting a Sudoku variant that does not utilize any digits. It may involve alternative symbols or shapes instead of numbers, similar to the idea explored in the 'Numberphile' video titled 'Illegal Numbers', where Sudoku rules are applied in non-traditional ways.

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