Cat Sudoku Level 218 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 218 Strategy
Expert Level 218 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 218 Solution
Solution cells: R1C4, R2C9, R3C3, R4C7, R5C2, R6C6, R7C8, R8C5, R9C1.