Cat Sudoku Level 156 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 156 Strategy
Hard Level 156 uses a 8x8 board with 8 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 156 Solution
Solution cells: R1C3, R2C7, R3C4, R4C1, R5C5, R6C2, R7C6, R8C8.