Cat Sudoku Level 221 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 221 Strategy
Expert Level 221 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 221 Solution
Solution cells: R1C2, R2C6, R3C1, R4C9, R5C5, R6C8, R7C3, R8C7, R9C4.