The versions of the patches with "Carnage Persistence" do not work with the "Online Hack" method of playing online.
All other instructions including those for alternate methods of online play detailed for the regular "Co-Op Hack" patches still apply to the patches with Carnage Persistence added.
Carnage Persistence is a hack which causes things like blood, limbs, dropped weapons, severed heads and corpses to linger on the battle field instead of fading away like they normally would.
Because of how the hack works, some levels may require backtracking to the previous room before the life force door for the room will open to the next, but generally the game is playable as it normally was.
Note that because of enemy corpses and other objects littering the field, some enemies which must be killed to allow progress won't appear until some of the objects laying around are picked up.
These enemies may stand still and be hard to spot when they finally appear, so look out for them.
They tend to react violently if you shoot them without killing them.

Enjoy the picturesque battlefields and co-op play.
