This is a portal mod I'm working on. Donald Otter is apparently friends with Cave Johnson , and Cave has given Donald permission to copy Aperture Science products.(This is coming out of my imagination, not Valve's). You are a test subject at Otter Research Facility. I am not yet going to make a mod page, as I only have one map done ATM.
This map is an old parking garage in Otter Research Facility. Today, Donald is using it as a storage room, and an entrance. I am going to have to do some work on the lighting. Tell me What you think needs improvement.