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Total Blackout Sudoku (329)
Instruction:
Complete the grid so that each row, column and 3x3 box contains 8 distinct digits in the range 1-9. The digits in the cells orthogonally adjacent to each black square must give an identical total sum.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2017 - Round 4
(5)
Parent puzzle:
Sudoku