Terminal Velocity Achievement Guide

Trying to get the Terminal Velocity Achievement in Portal? This guide should help you get that achievement as quickly as possible!

Finding the perfect test chamber

Welcome to this guide! First we will need to find the perfect test chamber to do this achievement on. I would prefer a test chamber with a high ceiling, such as Chamber 14 and 18. However, you can do this on any test chamber as long as you have the dual portal device (Test chamber 11 and up).

Getting the achievement

First, you will need to find a ceiling and floor in your test chamber. Make sure you can portal through both. Now, look directly at the floor and press MOUSEBUTTON1 on the ground. Then look directly up at the ceiling and press MOUSEBUTTON2. Now make sure you're looking down as there is a chance that the loop will stop if you look up. You should get the achievement in around 4-7 minutes depending on your speed.