Here you can download Portal | Underground Story To install, follow the Install steps.
Portal | Underground Story
created by Marty and Toby.
This Portal story is based on the MTN Portal Story | Part One!
This mappack includes around 75 levels.
in this mappack have Project One, Project twO and a Training room for Project twO
the Project One isent that good as Project twO beoucse the Project One was my second map i creat.
I learned alot of mapping when i make the One. so the twO is much better.
# Based on MTN Portal Story | Part One.
# Around 75 test chambers.
# Level design similar to the original Portal style.
# Level difficulty is balanced, like the original.
# New gameplay elements, e.g. super jumps and red laser.
# Easter eggs and secret chambers.
# Several paths and two possible endings.
# Awesome storyline.
# Epic moments/endings.
Don't forgett to read the "Read me!"