Cat Sudoku Level 170 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 170 Strategy
Hard Level 170 uses a 9x9 board with 9 colored regions. It starts with 1 fixed cats to anchor the solve. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 170 Solution
Solution cells: R1C1, R2C3, R3C5, R4C7, R5C4, R6C2, R7C8, R8C6, R9C9.