Cat Sudoku Level 87 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 87 Strategy
Medium Level 87 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 87 Solution
Solution cells: R1C7, R2C1, R3C8, R4C3, R5C5, R6C2, R7C6, R8C4.