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Games which seek to lead the player on a journey through an uncertain and challenging world.

A game that has some of or all of the mechanics: Limited interaction or the ability to be played without interaction, rapid growth - often exponential, prestige mechanic(s), An end goal/mission or a general goal of getting a higher amount of currency, and a system of buying and upgrading buildings, units, or similar.

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