Overview
This guide will teach you how to install the official un-released 2D Half-Life game by Valve; Codename: Gordon
Step 1: Open the web browser
Now you need to open the web browser of your choice. You need to paste this in the URL bar:
steam://install/92
Make sure you don’t make a google search.
Step 2: Installing
When done, a Steam window should open telling you that you’re installing Codename Gordon. Install it.
You’re done!!
Credits
Credit to kacpi26 on YouTube!
You can watch his video on Steam easter eggs here: