Cat Sudoku Level 254 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 254 Strategy
Master Level 254 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 254 Solution
Solution cells: R1C7, R2C9, R3C3, R4C10, R5C8, R6C6, R7C4, R8C2, R9C5, R10C1.