Cat Sudoku Level 256 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 256 Strategy
Master Level 256 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 256 Solution
Solution cells: R1C5, R2C9, R3C4, R4C1, R5C7, R6C10, R7C6, R8C2, R9C8, R10C3.