Cat Sudoku Level 101 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 101 Strategy
Hard Level 101 uses a 9x9 board with 9 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 101 Solution
Solution cells: R1C6, R2C1, R3C7, R4C2, R5C5, R6C9, R7C3, R8C8, R9C4.