Cat Sudoku Level 20 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 20 Strategy
Easy Level 20 uses a 6x6 board with 6 colored regions. It starts with 2 fixed cats to anchor the solve. Work from the tightest rows and regions before placing a cat.
Cat Sudoku Level 20 Solution
Solution cells: R1C1, R2C4, R3C6, R4C3, R5C5, R6C2.