Cat Sudoku Level 228 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 228 Strategy
Expert Level 228 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 228 Solution
Solution cells: R1C1, R2C5, R3C3, R4C6, R5C4, R6C8, R7C2, R8C7, R9C9.