Sudoku Overview

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Visual Hints
Into Sudoku has a very powerful hint system. You can ask for a small hint, a big hint or ask the computer to take a step for you. When you ask for a big hint, colors and lines are used to visualize the hint. Below you find a few examples of visual hints for various steps.
The pointing pair hint highlights the cells that form the pointing pair. In this example the values 2 are interesting.

Pointing Pair
In the example below cells are highlighted to show a Sword Fish pattern.

Sword Fish
The Empty Rectangles technique uses a strong link and a weak link. The strong link is visualized with a solid line, the weak link with a dashed line. The purple cell indicates the cell that is in the same group with a cell from the weak link and the strong line. Combined these marks clearly show the pattern.

Empty Rectangles
A hint for the colors technique uses a filter that filters out the important candidate value, in this case the number 8. Colors are used to color the cells so the pattern becomes visible. The yellow highlighted cell is the cell where the candidate 8 can be excluded from.

Nice Loops can be formed with strong links and weak links. Into Sudoku draws these links using solid and dashed lines. You can also draw lines and colors manually.

Nice Loop
The links that form a Dual Implication Chain are drawn in a way that these can be understood easily by the player.

Dual Implication Chain
Triple Implication Chains are extremely hard to spot for humans. Into Sudoku helps you understand this advanced technique.

Triple Implication Chain