Dog Sudoku Level 180 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 180 Strategy
Hard Level 180 uses a 9x9 board with 11 bones. Use the row and column dog counts first, then resolve bones with limited neighboring cells.
Dog Sudoku Level 180 Solution
Solution dog cells: R1C9, R2C4, R3C2, R3C8, R4C5, R6C2, R6C4, R7C7, R9C1, R9C7, R9C9.