Synergy is a simple Half-Life 2 Modification (Mod) that enables you to play through the Half-Life 2 series and many other 3rd-party campaigns cooperatively with friends
Codename: Gordon presents an alternative to the storyline of Half-Life 2, with locations inspired by both Half-Life and Half-Life 2. Along the way, Gordon Freeman — the protagonist from the canon games — meets with some of the main characters of the [...]
