Cat Sudoku Level 251 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 251 Strategy
Master Level 251 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 251 Solution
Solution cells: R1C4, R2C7, R3C10, R4C3, R5C1, R6C5, R7C9, R8C2, R9C8, R10C6.