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When jumping over obstacles is one of the main actions, challenges, or mechanics of the game.

Using only symbols available in the "ascii" set of characters

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