one interesting use of hex grids I came across is Sunset Overdrive's implementation of a streaming open-world system: https://www.gdcvault.com/play/1022268/Streaming-in-Sunset-Ov... hexagons are closer to circles than squares are, so they define chunks of the world as circles (positional coordinates for stuff in the chunk are offset from the center of the circle), packed in a hex grid. they explain the rationale more in the video, but if I remember correctly it just kinda makes a lot of sense given that a.) Sunset City's layout isn't very square-grid-based, and b.) it reduces the number of chunks per concentric "LOD layer" surrounding the chunk the player presently occupies (6 instead of 8 for the first layer, etc.)