Tier 3 is an upcoming mod for Portal and Portal 2, it will take place in the year or so before Portal. Kat, the main character, is an elite test subject raised for the sole purpose of being the perfect test subject. Over her many years of testing, she has exhibited the kind of behavior GLaDOS hoped for. However, the Aperture Science Handheld Portal Device is nearly finished and Kat yearns to see the outside. After all, GLaDOS won't need her after she can finish the ASHPD, right?

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Wake Up Room Music

Wake Up Room Music

Music

This one's going to be nice and short- there is a lot more to this one and it's quite a nice piece, done by Innovator in Science member Van Kinesys.

Tier 3 Theme

Tier 3 Theme

Music 2 comments

Here is some of the music of Tier 3. While we won't post ALL of it, we'll give you a good idea of what kind of feel we are hoping to reach withour mod.