Cat Sudoku Level 209 Hint
Look for a region whose legal cells are squeezed by two or more neighboring rows. High-level puzzles often move through exclusion, not obvious singles.
Cat Sudoku Level 209 Strategy
Expert Level 209 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 209 Solution
Solution cells: R1C7, R2C2, R3C8, R4C3, R5C6, R6C4, R7C9, R8C5, R9C1.