4 i think, im hitting a wall though now, theres not alot to do.
Once you craft vehicules and realize that youve seen everything no matter what direction you go in, it sort of gets stale.
Im not sure if the bosses drop different loot though, and if they always respawn at the same spot (Which would make it interesting to explore the map see what bosses drop the best loot and build your base near it)
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