Dog Sudoku Level 56 Hint
Find a bone with only two or three available neighboring cells, then test those cells against the row count, column count, and no-touch rule.
Dog Sudoku Level 56 Strategy
Medium Level 56 uses a 7x7 board with 6 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 56 Solution
Solution dog cells: R2C1, R2C7, R4C1, R4C3, R5C6, R7C7.