Cat Sudoku Level 243 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 243 Strategy
Master Level 243 uses a 10x10 board with 10 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 243 Solution
Solution cells: R1C9, R2C5, R3C7, R4C2, R5C10, R6C3, R7C6, R8C4, R9C8, R10C1.