Cat Sudoku Level 164 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 164 Strategy
Hard Level 164 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 164 Solution
Solution cells: R1C1, R2C8, R3C3, R4C7, R5C4, R6C6, R7C2, R8C5.