Sudoku Note is a handwriting-first Sudoku app designed for calm, paper-like problem solving. Instead of tapping numbers on a keypad, users write numbers directly on the board using Apple Pencil or touch. You can erase, rewrite, and make small notes—just like solving Sudoku in a real notebook. Handwriting is the core interaction, not an optional feature. Puzzles are carefully curated by solving techniques, allowing users to focus on thinking and exploration rather than speed or pressure.