Game Rules:

Rule 1: The game board is a 9x9 grid, divided into nine 3x3 sub-grids.
Rule 2: The objective is to fill the empty squares with numbers from 1 to 9.
Rule 3: Each column must contain all the numbers from 1 to 9 without any repetition.
Rule 4: Each row must contain all the numbers from 1 to 9 without any repetition.
Rule 5: Each 3x3 sub-grid must contain all the numbers from 1 to 9 without any repetition.

Controls:

Action: Click or tap on an empty square to select it.
Action: Use your keyboard or on-screen number pad to enter a number from 1 to 9.
Action: You can use the "Erase" button to remove a number you have entered.

FAQ:

Q: What are the different difficulty levels?

A: Ultimate Sudoku offers three difficulty levels: beginner, intermediate, and advanced. The beginner level has more given numbers, while the advanced level has fewer given numbers, making it more challenging.

Q: Are there any hints available?

A: Yes, there is a "Hint" button that you can use if you get stuck. However, use it sparingly as it will reduce your final score.

Q: Can I play Ultimate Sudoku on my mobile device?

A: Yes, Ultimate Sudoku is a browser-based game that can be played on both desktop and mobile web browsers.

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