One-Click Sudoku

One-Click Sudoku is a lightweight Sudoku game that opens from the Chrome / Edge toolbar in one click. Once installed, you can play without an internet connection. There is no account creation, login, or other setup hassle. Features: - Desktop / mobile UI: The layout is designed to work comfortably on both wide desktop screens and tall mobile screens. - Theme options: Follow the system appearance or choose Light or Dark mode. - Adjustable and reproducible puzzles: Choose the clue count, and use the same seed with the same clue count to recreate the same puzzle. - Notes and red notes: Keep track of candidates with regular notes or highlighted red notes. - Undo / Redo: Step backward or forward through number and note input. - Hints and solution display: Reveal one correct value or show the completed solution when needed. - Save / Load: Save the board, notes, timer, and Undo / Redo history as a local JSON file and resume later. - Keyboard, mouse, and touch controls: Play comfortably with the input method you prefer. - Built-in timer: Track your solving time while you play. - Number of completed boards: A single template family alone can generate more than about 609.5 billion transformed completed boards. The app uses multiple template families, so the overall variety is even larger. One-Click Sudoku does not show ads, require payments, or collect personal data. It does not make external network connections during gameplay. By default, no preferences are stored in the browser. If you enable Save settings, the clue count, seed, language, and appearance preferences are stored locally and restored on the next launch. Turning Save settings off removes them. Gameplay information is never sent outside the browser.