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The Sudoku puzzle was introduced in Japan in April 1984 as Sūji wa dokushin ni kagiru (数字は独身に限る), which also can be translated as "the digits must be single" or "the digits are limited to one occurrence" . Click the and play the game. There are three levels of difficulty. Use a stopwatch / timer / or clock to time how long it takes you to complete the puzzle. TIPS & TRICKS Focus on a specific part of the puzzle: When solving Sudoku puzzles, players often feel as if they need to solve the entire puzzle from the beginning. But that’s not the case. Any one Sudoku puzzle contains multiple puzzles within it. Start by focusing on a column, row or box. Once you’ve solved that piece of the puzzle, move on to the next part. Spot the missing numbers: Beneath each puzzle are buttons you use to enter the numbers 1 to 9. Each of these buttons has a small number in the top right corner -- that’s the number of times that the big number already appears on the board. Start with the big numbers that appear most often. For example, if the 7 button has a small 5 in the top right corner, that means there are already five 7s on the board. You can click a 7 on the board to highlight all five 7s in the puzzle. Use this to figure out which rows, columns, and boxes don’t yet have a 7. That makes it easier to place the remaining 7s. TAP when you have finished and answer the questions on the TAP when complete