Cat Sudoku Level 158 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 158 Strategy
Hard Level 158 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 158 Solution
Solution cells: R1C9, R2C5, R3C8, R4C4, R5C1, R6C7, R7C2, R8C6, R9C3.