A grid is a framework of connected areas (often in the shape of regular polygons). Though a grid has many uses in puzzle design, its most common application is for a solver to be presented with one or more unfilled grids (which may or may not contain aids for placement or extraction) and a list of items to be inserted (either directly or clued). The structure of the given grid will typically feature many points at which inserted items will overlap, which serves as both a method of gradual hinting, as each correctly placed item will give one or more hints to the placement of other items, and of solution uniqueness.

Examples of types of grids include: