Cat Sudoku Level 56 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 56 Strategy
Medium Level 56 uses a 8x8 board with 8 colored regions. It starts with 2 fixed cats to anchor the solve. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 56 Solution
Solution cells: R1C6, R2C1, R3C4, R4C2, R5C8, R6C5, R7C7, R8C3.