Sudoku

Even if you have never played a game of Sudoku, you must have heard about its irresistible fun. Why not try it yourself online and treat yourself with excellent logical training? In this game, your goal is to fill in the blanks with numbers 1 to 9 such that the numbers will not be repeated in each row, each column, and each 3x3 square. You will be given a 9x9 grid, which is evenly divided into 9 squares. Some of the blocks are already filled by numbers, while the others are blank. A number pad is placed on the left of the grid, and you may click a number to fill a blank on the grid. Only a valid number which does not violate the rules of the game can be placed. If you would like to remove a number previously put onto the grid, you may click the cross button at the bottom of the number pad to erase it. If you are not able to put a number, you may click the Hint button under the grid to reveal one of the answers. However, each hint provided will add 50 seconds to the time you have spent, as indicated at the top left corner. Finish the puzzle in no time and soar to grand new heights on the leaderboard!