Sudoku Online Free is a number-placement logic-puzzle game. It's an online version of classic Sudoku that requires the player to use numbers 1 to 9 to fill a 9x9 board of nine-cell columns, rows and sub-grids without repeating numbers in the same line or sub-grid or in overlapping ones.
The game presents the player with many play options, including daily missions and difficulty levels. With a daily mission, the player earns a bonus for solving a Sudoku puzzle. To win, they must complete the puzzle without making more than three errors.
With standard levels, the player attempts to rank as one of the best players online via Very Easy, Easy Difficulty, Medium Difficulty, Hard Difficulty, Sudoku Expert!, and God of Sudoku! challenges. The number of permitted errors changes across types. With Very Easy, the player can make infinite mistakes and receive several hint opportunities. With the God of Sudoku! challenge, they can only make one error and receive no hints.
The player must insert missing numbers into all unused nine-cell spaces. They can take notes to track previously attempted numbers. The game also supplies them an eraser. They earn more access to these tools by winning games.
Sudoku Online Free helps the player focus on their moves by turning the cell they select orange and closest the column, row and sub-grid dark blue. If the player makes a mistake, it turns the cell bright red.
