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We want our site to work perfectly. If you've encountered a bug, are missing a solution, or just need help - let us know!
Write to: moc.ti-oulf@tcatnoc
A Sudoku board is in front of you. Your goal is to fill it with digits from 1 to 9. In this stage, you will learn a basic technique: grid scanning. Your task will be to find a unique digit in the highlighted cell, focusing on three areas:
Remember the golden rule: each digit can only appear once in a given row, column and block
We start by scanning the rows on the horizontal axis. Look at the first row from the top. There are already some digits in it, which means that:
You must treat each of the 9 rows as a separate, closed line in which there will be unique digits
Now move your eyes to the columns. They work exactly the same as rows, but vertically:
You must treat each of the 9 columns as a separate, closed line in which there will be unique digits
Time for the third area, which is 3x3 blocks (bold squares). Each of the 9 blocks follows the same rule:
Often it is the analysis of the small block that most quickly suggests the missing digit.
To make your task easier, our game automatically colors related fields. When you click on any cell, the system will highlight in a different color:
Everything that is highlighted is your restriction zone – that's where you look for uniqueness.
Let's put the knowledge together and fill the first cell in the top left corner. Let's look at its highlighted row, column and block:
Together we have digits such as: 2, 3, 4, 5, 6, 7, 8, 9. So the digit we are looking for is: 1