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Spatial partitioning refers to dividing up some space (such as the game world) into regions with the intent to efficiently search or traverse those regions or the objects within those regions.

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Looking for a 2D spatial partitioning method for my top down browser game

The library you're using should do what you want. I tried it — demo here, with the default power of two setting (5): You have to specify the “area of interest” in the retrieve function. The library …
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