Grid Insight

Grid Insight is a feature that automatically analyses grids as you design them and insert words, showing any problems. It will also show forced words and letters in squares where the current grid pattern and letters require particular words or letters to be used to complete a fill.

The Grid Insight feature can be turned on and off by clicking the round button on the far right of the lower toolbar. The color of the button indicate whether the current grid is fillable with words: red indicates that no fill is possible, green that at least one fill exist, and gray that the area is already filled or fillability is not easy to determine.

Exactly which things Grid Insight checks can be customized by clicking on the Grid Insight button:

• Duplicate words: any exact repeat of a word will highlight both slots
• Duplicate substrings (Pro Filler only): while highlight any repeated sequence of letters above a specified length
• Words not in list highlights spelling mistakes, or more specifically words that are not in your word list
• No fitting word highlights partially-filled word slots where no word in the list will fit
• No intersection highlights pairs of word slots where no intersection is possible using words in the word list
• No group intersections highlights slots that cannot be filled consistently simultaneously with nearby and intersecting slots. The reason for this kind of failure cannot be fully localized, and it is a failure of a multiple word slot constraint.
• Forced letters shows any letters which are forced by all possible fills as grey in the grid
• Full Fill Check tests whether the entire connected unfilled area is fillable, and updates the Grid Insight button color accordingly. The time limit for this check can be specified, so large amounts of computer resources are not wasted trying to find fills for only partially-completed grids.

If Grid Insight finds forced letters or words (shown as small letters in the grid), you can accept them by pressing Ctrl+Return.