There is something called Decay on the first half-life where you play as two women during the incident. There is also a half-life 2: deathmatch, and that's more or less it.
There is Half-Life Deathmatch and Half-Life Deathmatch: Source. You can also download a mod, "Sven Co-op", which allows you to play the Half-Life story with other players.
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i dont no how can someone tell me do u need the same game?
You can play multiplayer as long as you have internet. Internet cable or not.
By co-op you mean mulitplayer. Yes. Half-Life 2: Deathmatch is only on PC.
You need an account to play minecraft multiplayer.