# Grid helpers

**Status**: Approved | 2025

**Author**: Victor Ma

**Reviewer**: Jonathan Blandford

Grid helpers aid the user in creating and filling the grid.

| Grid helper | Description |
| ----------- | ----------- |
| Unch detector | Highlights unchecked cells.
| Short clue detector | Highlights clues that are two-cells long.
| Duplicate substring detector | Highlights duplicate substrings on the grid.

The following grid helpers require a grid-level word suggestion algorithm:

| Grid helper | Description |
| ------------| ----------- |
| Fillability indicator | Indicates whether or not the grid is fillable. If at least one clue is unfillable, then the grid is unfillable.
| Cell constraint heat map | A heat map overlaid on top of the grid that indicates how constrained each cell is. A cell that can be any letter from *A* to *Z* is completely unconstrained. A cell that can only be a single letter is maximally constrained.
| Most-constrained-clue button | A button that moves the cursor to the most constrained clue. The most constrained clue is the clue that has the smallest set of possible words---and that is not fully filled.