Cat Sudoku Level 68 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 68 Strategy
Medium Level 68 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 68 Solution
Solution cells: R1C2, R2C4, R3C1, R4C7, R5C3, R6C5, R7C8, R8C6.