Unity is a Cooperation mod for Half-Life that aims to keep the campaign as vanilla as possible, While still being co-op. That means no monsters that weren't in the original game and no new weapons. Just good old Half-Life the way it was meant to be played but with your friends.
Officially 42% done. Anomalous Materials, Unforeseen Consequences, Office Complex, We've Got Hostiles, Blast Pit and Power Up are now all done! Working on On a Rail now!