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A game where you have to start over from the beginning when you die. Often goes together with procedural generation, so it doesn't get boring!

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.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Similar to roguelike games but generally with simpler or more forgiving rules & mechanics.