Versus Mode its bloody awesome, I was up all night playing it!!
I found myself cackling loudly as I watched the chaos I had coursed.
Each side gets a chance to play both infected and survivors, the survivors get scored on how far they get on the map before dieing, if they make it to the end of the lvl then the get points for how much health they all had left and if they all made it etc. After they all die or get to the end, the game swaps everyone around for that map. After both sides have played as the survivors it moves onto the next map in the campaign.
The infected get points for the amount of attacks they do to survivors, or assisted attacks from the npc infected.
The AI Director chooses which monster you will spawn as, and there cant me more that a certain number of some classes. The Tank doesnt spawn often but your told if you will be spawning as it and everyone gets a change to play him. He spawns randomly around the level, you dont get to choose where, also he has a frustration metre if you dont get into combat soon you loose control of him, its a way to stop players hiding him somewhere. As the other infected you spawn ontop of the survivors as a ghost you then have to go find somewhere to hide that's out of sight and not to close to them before you can come into the game. You can see the survivors at all times as they have a green, yellow, red glow around them depending on there health status. Only time you cant see them is if there standing still with there flashlight off. There are points around the map that let you climb up walls, drainpipes etc. All the bosses make a sound so they know your near to them. The only one that doesnt is the Hunter he only makes a noise when you crouch to charge up your pounce attack. Playing the Hunter is very twitchy as you can pounce all over the place, think of playing the Alien in Aliens Vs Predator
Playing as the boomer you don't last long, once they see you your pritty much dead. One time as a Boomer I got x50 assisted hits from one Puke attack on a player cuz of the crowd of zombies that came running at him
I was playing the tank on the hospital roof, and won the match, one guy I was going after backed away and slipped off the edge and was left hanging on the ledge so I turned my attention to the others. I was able to throw them off the building with my hits, god that was so funny. As the round was ending I kept trying to knock of the last man who was left hanging but with all the excitement I fell of the building lol.
Some people on the Steam forums say the PC and Console versions play differently, and they seem to prefer the PC version, they didn't really explain why.