Sudoku!

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Sudoku!

Game objective:

Fill in the grid so that every row, column and 3x3 box contains all digits 1-9 only once, as quick as you can.

Game controls:

Make sure the PLACING mode is selected on the right (that is the default state). Select a number on the left column with the left mouse button. Then click on the 9x9 box where you want to put the just selected number.

If a number shows up as WHITE it means that it is currently a valid placement, but it does NOT mean it necessarily is the correct number for the final solution. If a number shows up in RED it means it is currently in conflict with another number on the board, which will also turn RED. A YELLOW number is one of the initial numbers which cannot be changed.

To clear a number you just accidentally placed you can either click a second time, or select the eraser in the lower left of the game and then click on the cell.

Another technique is to switch to TESTING mode by clicking the TEST button in the upper right corner, you can then left click to toggle on or off a test number (small numbers in each cell as a way of remember which numbers can or cannot be placed there) and right click to place the large number.

Score:

Scoring is based on the time it takes you to complete the puzzle and your level of difficulty. 1 minute is added to your final completion time for each descending level of difficulty. So, difficulty level 10 has no time added to your final time, while difficulty level 1 adds 9 minutes (540 seconds). Using the AutoHinting feature (by pressing the A key) will add 1 minute to your time.