Valve's Portal series has been used as the pretext for many achievements outside of puzzle gaming, including getting hitched. Keeping you from shuffling off this mortal coil, however, is still new. Two Horns United has given a gas mask a decidedly nerdy visual upgrade that resembles the game's iconic Aperture Science Portable Quantum Tunneling Device, right down to the light-up energy chambers. Best of all, unlike some homebrew projects, you'll have a (pro
