Parallax scrolling is a super important element videos games of all types - 2D, 3D, and VR - as well as even on websites! In 2D games, the idea is to make different parts of what you see in the game scroll at different speeds. This helps make the game look more realistic when you're moving. As you play Neutron Star, notice how the purple background, gray square grid, and gray circles all move at different speeds.