To the right is an example of a partial Sudoku puzzle. Using only the given information, there is a way for you to locate the position of a "1" and another number on the grid. Can you figure it out? Move your mouse over the puzzle to reveal the answer. The correct position of the "1" will be revealed, and the correct position of the other number will be highlighted in green.

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Step-by-Step Explanation:

1. Look at the first row. Each row can only contain the digits 1 though 9 once because of the rules. The first row already has every digit but "1" and "9," so the remaining boxes in the first row, highlighted in yellow, must be "1" and "9."
2. Look at the second column. There can't be any additional "1"s in that column because there is already a "1" in that column. The second column is darkened because a "1" can't go in that column. Of the two boxes that "1" and "9" had to be in, the "1" can only be in the first box because the other box can't be "1". The box that the "1" has to be in is highlighted green.
3. Look at the first row again. Each row can only contain the digits 1 though 9 once because of the rules. The first row already has every digit but "9," so the remaining box in the first row must be "9." The box that the "1" has to be in is highlighted green.