Cat Sudoku Level 223 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 223 Strategy
Expert Level 223 uses a 9x9 board with 9 colored regions. It starts without fixed cats, so the region shapes and no-touch rule do the work. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 223 Solution
Solution cells: R1C2, R2C4, R3C1, R4C3, R5C8, R6C6, R7C9, R8C5, R9C7.