Quote Originally Posted by GreatEmerald View Post
Hm, I have no clue about Half Life itself, but this list sounds a lot like just mods for HL. Not that it's bad, but if it really is the case, then the article title isn't quite correct.
Opposing Force and Blue Shift were the 2 official expansion packs to the original Half Life game. They were really good though - basically full sequels if i remember right, just using the same engine so i guess they got tagged expansion packs.