Cat Sudoku Level 168 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 168 Strategy
Hard Level 168 uses a 8x8 board with 8 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 168 Solution
Solution cells: R1C7, R2C2, R3C6, R4C1, R5C5, R6C3, R7C8, R8C4.