Cat Sudoku Level 252 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 252 Strategy
Master Level 252 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 252 Solution
Solution cells: R1C3, R2C10, R3C2, R4C4, R5C6, R6C1, R7C7, R8C9, R9C5, R10C8.