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Utilizing content created by algorithms rather than human made content. Often utilizes a "seed," a relatively small string that is used to control the randomization algorithm that generates the entire world.

A game in which the player is not constrained to achieving specific goals and has a large degree of freedom to explore, interact with, or modify the game environment 

Voxels are small geometric primitives used to construct larger worlds. Sometimes called 3D Pixels, they are typically cubes.