[BreakABone]

Some more information since looked at the rest of GT's videos.

n the deathmatch "Versus" mode, four additional players can take control of powerful Infected with unique abilities, amongst the other AI-controlled Infected. The playable Infected numbers are limited so players must select their preferred Infected and wait for it to spawn, with the Tank as the exception — it's only playable a few times during each scenario. The Infected have the ability to see survivors through the walls at a certain range if the survivors are running, with the flashlight on, or talking. The Infected can also see in the dark, unlike the Survivors. Infected spawn ahead of the Survivors and can, if they stay still, see a marker for their likely path of advance so they can set up ambushes. Throughout levels, Infected-only ways up buildings are marked with symbols. These can be climbed and used for ambushes, especially with the Infected immunity to falling damage

Xbox 360 version

The Xbox 360 version of Left 4 Dead has different game modes from the PC version — co-op (2-4 players), online death match (2-8 players) and Co-op versus (4 versus 4). The game supports split screen and system link play.[9] Also, the quick key voice commands have been removed in favor of the Xbox Live headset