Synergy (Half-Life 2 Co-op)

Synergy is the Half-Life 2 cooperative modification that enables you to play with others through Half-Life 2 and its episodes (Episode 1 and 2), as well as our own levels. You may also install other third-party mods, such as MINERVA: Metastasis and ROCK 24, to also play them cooperatively with other players. Synergy tries to maintain the true Half-Life 2 gameplay, while still adding in our own unique ideas.