Sudoku
 Goal of the game
 1. No duplicates of the numbers 19 horizontally.
 2. No duplicates of the numbers 19 vertically
 3. No duplicates of the numbers 19 in the 3x3 cell groups
 Click on a cell and use your keyboard to type in the numbers

 Rules Of Sudoku Puzzles (known also as SUDOKO, SUDOKU)
 The puzzle is most frequently a 9x9 grid made up of 3x3 subgrids (called "regions"). Some cells already contain numbers, known as "givens". The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 9 exactly once. Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.

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