GLaDOS is making new and challenging tests with new elements.
As you advance from test chambers, you find out more about yourself and Aperture.
The Portal projectile has a longer lifetime and a more dynamic effect,
the particles has a lower translucency.
The portal has a softer noise level.
There are portal particles flowing around the portal and projectile rope.
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Yes, it's a bit bright. But it'll be changed later in development.