Cat Sudoku Hard
Activate a square to cycle between empty, cat, and crossed out. Place one cat in each row, column, and color. Cats cannot touch, even diagonally. Arrow keys move between squares.
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Hard cat sudoku uses a 9×9 grid. The rules do not change. There is just more to keep in mind.
Same rules, more to track
Hard cat sudoku is a 9×9 queens-style grid. You still place one cat per row, column, and color, and cats still cannot touch. The extra room means more crosses before a square is forced.
If you want a warm-up first, easy cat sudoku uses the same buttons on a smaller map.