Sudoku

Overview
Immerse yourself in the classic brain teaser with Sudoku! Enjoy a sleek user interface, variety of difficulties, and a multitude of features designed for avid puzzle enthusiasts.

Key Features
1. Four levels of difficulty to challenge beginners to experts.
2. Three intuitive input modes for personalized gaming: "Digit first," "Cell first," and a popup method.
3. Pencil marks with an auto-fill/or erase feature to keep your game board organized.
4. Highlighting options include selected digit highlights and possibility to show how many digits are placed.
5. Convenient auto-save functionality to retain your progress.
6. A comprehensive Undo/Redo system for adjustable gameplay.
7. Logical and intelligent hints system that enhances puzzle-solving.
8. Automatic error checking to guide you with two selectable levels.
9. Online result submissions and progress tracking.
10. Leadership board access and provision to partake in weekly online competitions.
11. Gameplay supportive of trackball, touchscreen, and keyboard.
12. In-game advertising with options for ad format preference.

Interesting Gameplay
1. Fill each 9x9 grid so that every row, column, and 3x3 sub-grid contain all digits from 1 to 9 without repetition.
2. Satiate your competitive edge by uploading scores and see where you rank among other Sudoku savants.
3. Utilize pencil marks for possible candidate numbers in cells.
4. Collaborate with Sudoku's smart hints that refrain from spoiler-laden answers, ensuring genuine puzzle enjoyment.
5. Take advantage of the comprehensive help and error features to learn the ropes and refine your strategies.

Play Sudoku on the go and experience puzzle joy that travels with you.