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040000200000902006020067008067410020250090400000000700000000050480500000000681000 #Extreme
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This pack contains sudoku grids in ADK format. Each file contains 1000 sudoku (1 per line).
If you do not have the possibility to create your own grids but your application or device manages this format by copy / paste or by importing text file you can take advantage of grids already automatically generated here.
Good game!
https://github.com/Musclorman/Sudoku-autogen-in-ADK-format