Cat Sudoku Level 259 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 259 Strategy
Master Level 259 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 259 Solution
Solution cells: R1C10, R2C2, R3C8, R4C1, R5C5, R6C3, R7C6, R8C9, R9C7, R10C4.