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Games that never end. Infinite levels, limitless waves, and unbounded challenges.

Games that defy the traditional approach to game design and offer unique, interesting and often strange experiences.

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.

PROCJAM is the Procedural Generation Jam, an annual event about making things that make things.

http://www.procjam.com/

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets.