Cat Sudoku Level 255 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 255 Strategy
Master Level 255 uses a 10x10 board with 10 colored regions. It starts with 1 fixed cats to anchor the solve. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 255 Solution
Solution cells: R1C8, R2C5, R3C7, R4C1, R5C10, R6C2, R7C6, R8C3, R9C9, R10C4.