Compared to the infinite, multi-layered worlds of modern Terraria, version 1.0.0 was much smaller and more isolated. However, it still contained the essential biomes that defined the game’s initial progression tier:
In the 1.0.0 release, the "end-game" was significantly shorter than the current version: Primary Bosses : The original roster included the Eye of Cthulhu Eater of Worlds Final Goal