Half-Life 2 with the Portal Gun

So you've played through Portal and loved every minute as much as we did. Maybe you've even gone through the advanced maps and tried out some of the challenges? So what comes next?

How about the ability to play through Half-Life 2, HL2 Episodes, or other Source-powered games with the portal gun in-hand? We've been doing that very thing for the past few days now, and after hours spent experimenting with various techniques and tricks, we're here to show you how.