We encourage the use of NPCs in any level, even if it's Deathmatch. However, Synergy also supports Deathmatch and Teamplay (Combine vs.
You work together as a team to finish the level. The main objective in Synergy, is for all players to complete the given objectives for each level Escape, Assault, Defend, etc. We merged and are now bringing you the best cooperative expirience possible. Synergy was previously known as two separate mods, 'DC Coop 2' and 'DevCoop'.
Synergy is, as the name suggests, a cooperative Half-Life 2 mod.