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Survival, 20,000 years apart.

Two base-building survival worlds at opposite ends of human history. In Polylithic, you begin as a Paleolithic hunter-gatherer scratching out a living in the Stone Age, then settle down and build a civilization from raw terrain. In Retreat To Enen, you arrive 1,500 years in the future to forage, craft, hunt, meditate, and explore three vast biomes on a restored island.

Same instincts. Opposite ends of the timeline.