Cat Sudoku Level 85 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 85 Strategy
Medium Level 85 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 85 Solution
Solution cells: R1C1, R2C6, R3C2, R4C4, R5C7, R6C5, R7C3.