In the Settings menu from the main menu in Terraria, the Parallax option controls how much the background scrolls relative to the foreground.
- A setting of 0 (default) will have the background (which consists of sky, walls, etc) scroll with the foreground (what you walk on and bump into etc).
- A setting of 100 will scroll the background tiles at a high speed compared to walking just a little to the left or right.
Settings of 0-100 (inclusive) are available.
This effect is most noticeable Underground when you can see the dirt backgrounds scrolling when you move and have parallax set high.
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