Cat Sudoku Level 52 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 52 Strategy
Medium Level 52 uses a 7x7 board with 7 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 52 Solution
Solution cells: R1C2, R2C6, R3C1, R4C5, R5C3, R6C7, R7C4.