Cat Sudoku Level 157 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 157 Strategy
Hard Level 157 uses a 9x9 board with 9 colored regions. It starts without fixed cats, so the region shapes and no-touch rule do the work. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 157 Solution
Solution cells: R1C4, R2C6, R3C9, R4C3, R5C5, R6C7, R7C1, R8C8, R9C2.