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Trivia Teaser

Which of these countries, population 320 million, has a red, white and blue flag?

United States


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How to Play Windoku

To solve a Windoku, every number from 1 to 9 must appear in:

  • Each of the nine vertical columns
  • Each of the nine horizontal rows
  • Each of the nine 3 x 3 boxes
  • Each of the four 3 x 3 window panes (shaded in blue)

Use the mouse to click up (or down) through the numbers 1 to 9 in each square. The small black arrows on each side of the square tell you whether you are counting from 1 up to 9 (right arrow) or from 9 down to 1 (left arrow).

Using your keyboard, you can type in up to eight practice numbers above the line at the top of each box.

When you have correctly completed a row, column, 3 x 3 box or window, that area fills with colour and any practice numbers will disappear.

Game Options

PRINT: Click to print your Windoku

  • Available to YouPlay Premium Members only
  • Selected puzzles only

SAVE: Click to save your Windoku

  • YouPlay Premium Members receive 10 save slots
  • YouPlay Members receive 3 save slots

PAUSE: Click to halt the timer if you wish to pause during game play

EXIT: Click to return to the Game Selection page

UNDO: Undo your moves one click at a time

CLEAR GRID: Undo all moves and start the Windoku again

Game Features

TOKEN COUNTER: Displays how many tokens you have won during the game

TIMER: The timer starts as soon as you open the Windoku

YouPlay BOOST: Boost your score - multiply your points by working faster and smarter

HINTS: Click to add an extra number to help you solve the Windoku

  • YouPlay Premium Members receive 6 hints
  • Youplay Members receive 6 hints

About Windoku

Windoku is a variant of the Sudoku puzzle that took the world by storm in 2005, quickly becoming the latest puzzle craze. Often referred to as a Japanese number puzzle, in actual fact, Sudoku has a long history with ancient origins. It is thought that Latin Squares, known since medieval times, are the progenitors of the modern grid.

American company Dell published the first contemporary Sudoku in 1979 under the name 'Number Place'. The puzzle soon found a large audience in Japan, and was renamed Sudoku (meaning 'single number') by publishing house Nikoli.

Windoku is different as it adds an extra challenge to the traditional Sudoku puzzle. Four blue 'windows' overlap the nine 3 x 3 boxes and also require filling with the numbers 1 to 9. Windoku is also known as NRC Sudoku or HyperDoku.

Scientific studies have recently shown that the focused mental activity used to solve puzzles can help prevent memory loss and degenerative brain disorders such as Alzheimer's - another reason to get your daily dose of puzzling fun!

The Windoku puzzles featured on YouPlay are presented by Lovatts Publications, leaders in the industry for over 25 years. With a reputation for exceptional quality, Lovatts Windoku puzzles will provide you with hours of brain-teasing entertainment.


Read the Wikipedia article on Sudoku: http://en.wikipedia.org/wiki/Sudoku

YouPlay Windoku Tips

1. You start the puzzle with several pre-determined numbers included as givens. These cells are marked and cannot be erased. Each time you start a new puzzle, a different set of numbers will appear.

2. The object of the game is to fill the empty cells with the numbers 1 to 9, with each number only appearing once in each column, row, 3 x 3 box and blue window.

3. For each empty cell, you must determine which numbers can be inserted, according to the game rules. In the beginning you may have several options for each cell.

4. YouPlay Windoku puzzles have a space at the top of each cell where you can type up to eight practice numbers that could be correct.

5. As you fill out the different options for each cell, you will find that several cells have only one number option that could be correct, which you can then type inside the cell.

6. Use the four window panes to check for singles, pairs, triples and the way they interact with rows, columns and boxes.

7. Whenever you type in a correct number, you should update the practice numbers for the remaining cells.

8. Repeat this process throughout the whole game and eventually you will complete the Windoku grid.

9. If you get stuck, you can use hints to help solve the puzzle. Click the HINT button once when you require a hint.