Whoa, whoa, whoa, WHOA. Back up there Kraetyz, before I shove a Metal Gear up your ass. The MGS series is the pinnacle of tactical stealth games and is widely considered to be one of the best. Portal, well, Portal is nothing more then a puzzle game that implements the ability to travel through walls (which people have been doing for a while via cheats and hacks) and is riddled with internet meme references. Portal shouldn't even be compared to the steamy goodness of the MGS series, let alone imposed over it.