There is even a Fishing level where you can fish up guns, platforms, hoverboats, advisors and even classic half-life enemies. Many levels have been custom made with co-op in mind. The main game still needs a lot of tweaking, but the glitches are mostly to do with the model poses, and this causes hilarity. So is this just Half Life 2 with tacked-on co-op? If you've got an idea that you believe may fit our situation, post on the forums. We currently have no "story" readily available at this time, however we hope to have an interesting one here soon. In Teamplay mode, you may join a Team (either Combine or Rebels) and fight the other team with friendly players and NPCs to complete map objectives. Player combat, play in the Deathmatch or Teamplay game mode. Get together with your friends and play through individual levels or full campaigns, such as the Half-Life 2 campaign, using a new set of weaponry against new enemies.
Synergy is a cooperative Half-Life 2 multiplayer modification, also supporting the original Deathmatch and Teamplay game modes.