Sudoku

Sudoku is a feature-packed Chrome extension that transforms your device into a complete Sudoku puzzle experience. With 4 difficulty levels and 3 input modes—"Digit first", "Cell first", and popup—you can customize gameplay to suit your preferences. The app includes pencil marks (notes) with auto fill and erase options, selected digit highlighting, digit count display, unlimited undo/redo, and intelligent logical hints to help you solve puzzles efficiently.

Never lose progress thanks to auto-save, and join a vibrant community by uploading your results to participate in weekly real-time Sudoku competitions. Sudoku supports multiple input methods including trackball, touch screen, and keyboard. It’s perfect for puzzle enthusiasts who want a seamless, competitive, and enjoyable Sudoku experience, available anytime without the need for paper puzzles.