Ten thousand years in the mountain

This is a stone-age fantasy setting where you play as members of a cavemen tribe, possibly of various human species, that's been trapped in the sprawling cave network under the mountain for over tens of thousands of years. Your only hints of daylight come from vertical vents that are too steep, too tall, and too narrow to climb. Your kind may eventually escape the mountain, but for now, you must survive the horrors within using nothing more than your wits and what little help the rain washes into your home.

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