Cat Sudoku Level 104 Hint
Find a colored region with only a few safe cells, then compare those cells against the row and column limits.
Cat Sudoku Level 104 Strategy
Hard Level 104 uses a 9x9 board with 9 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 104 Solution
Solution cells: R1C8, R2C4, R3C7, R4C5, R5C9, R6C3, R7C1, R8C6, R9C2.