Ultima Underworld: The Stygian Abyss is commonly considered the first role-playing game with fluid first-person movement in a real 3D environment. Unlike earlier first-person RPGs such as Dungeon Master or Eye of the Beholder, the player can move in every direction and the graphics are updated continually. The player is also able to look up and down with the press of a key, jump, and swim. The dungeon is not made entirely of corridors and rooms arranged in a rectangular fashion, but has a lot of variety: slopes, stairs, bridges, underground rivers, and more.
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