Normal Sudoku rules apply. Clues outside the grid show the sums of digits between the 2 and the 3 in that row/column. Wherever 4 appears in the grid, its (orthogonal) neighbours sum to 26.
Normal Sudoku rules apply. Clues outside the grid show the sums of digits between the 2 and the 3 in that row/column. Wherever 4 appears in the grid, its (orthogonal) neighbours sum to 26.