There are countless classic moments from the Half-Life 2 campaign. Who can forget the helicopter battle while taking the airboat out of City 17? Or the amazing battle against multiple Striders during the climax of Episode 2? While we'd always advise a new player to go through Half-Life 2's incredible journey alone for the first team, we still think that same journey would be even more replayable with an optional co-op setting. The first third of the game would take a bit of reworking, but we can see how the rest of the title would be perfectly suited to co-operative play throughs. Many of the later encounters could be cranked up to be extra challenging for a team of two. The underground stand-off against the Antlions, the tense passage through Ravenholm, and the rebel uprising through the war-torn streets could be particular fan favourites. Worked yourself up into a depression that you'll never be able to fight through City 17 with a friend yet? Good, because you'll be please to learn that some clever souls have actually managed to create a mod that brings exactly that, and it works beautifully.
