This works for single player only as of now, and is of course an incomplete feature, so don’t even think about bugs or balance! This is purely for fun and curiosity!

There are scraps of Versus mode inside the demo. Models, sounds, and yes, even helpful tool-tips and hint screens are included for playing the Infected bosses! If this post is somehow against the rules, delete it at your leisure.

1. From the starting screen, click Options, then Mouse/Keyboard, and enable the developer console.
2. Start a single player game and open your console with the ~ key.

3. Type “sv_cheats 1″ and press enter. This will enable cheat mode.

4. Type “ent_fire !self setteam 3″ and press enter. When you close the console, you will “die” and join the Infected team!

You get to choose where to spawn as a baddie! Press E to cycle through some suggested spawn locations, or to teleport directly to the survivors if you get too far away before spawning. But the next problem is that the AI controlled survivors will not leave their starting room and the game will not start on its own.

5. Open the console and type “director_force_versus_start 1″ and enter to begin the round.

The survivors will start hacking their way through the apartment building and you finally get to try your zombie character!

6. When you die (and you probably will), you will not respawn. Press space to cycle through different spectating modes till you are in in free flight mode. You must then use these commands in the console WHILE DEAD.
z_spawn tank
z_spawn boomer
z_spawn smoker
z_spawn hunter
These will spawn you as that infected at the spot you are currently “flying” while dead.

KEEP IN MIND that these are just scraps of Versus mode! These demo maps were not designed for it, and they are not balanced or bug free in any way! There are places where you will die as soon as you spawn among other fun ways to get stuck or “break” the level.


Next: Custom Maps reported by TIHan on the Steam Forums

The Director
- You will not be wading through hordes of infected from start to finish. What Valve has implemented is an AI Director that places the infected on the map in real time using no flags or checkpoints at all. It is intelligent enough to place them on it’s own, needing only a map to be able to work with.
de_dust.bsp was not modified.


This was merely a test to see how the AI Director works on randomly spawning zombies. Yes, there are a few errors and textures missing in de_dust even though I have extracted all the Counter-Strike: Source files into Left4Dead. Perhaps those missing textures and models are in other GCF files that I haven’t extracted out of. (Again, this was a test.)
Pretty much any map will work with Left4Dead. All you need is the textures, models, scripts, and sounds for the map as well as the nav mesh(l4d will tell you the map is unplayable, however, it still works as you can see).
More testing needs to be done if someone ever wants to fully incorporate any cs:s, hl2, dod:s, tf2 maps into left4dead. Some of it would require entity manipulation within the .bsp.

de_dust in Left 4 Dead Demo Tutorial
Left 4 Dead Demo is located in your \Program Files\Steam\steamapps\common\ folder. If you look in just your \steamapps\ folder you will see GCF files. These GCF files contain all game content for steam, except for the l4d demo.
First, what you want to do is make a backup copy of the Left 4 Dead Demo folder that is in the \Program Files\Steam\steamapps\common\ folder.
Next, download GCF Scape. http://nemesis.thewavelength.net/fil…cfscape131.exe Install it. Once installed, run it. When the GCF Scape is open, click File then click Open. Browse to where the GCF files are located, \steamapps\. Choose “counter-strike source shared.gcf”. You will now see a “root” folder expanded into “cstrike” and “reslists”. Expand “cstrike”. You will notice a ton of files. Select all the files and folders that are in “cstrike”. Make sure you have already backed up your Left 4 Dead Demo folder. Extract them to \steamapps\common\left 4 dead demo\left4dead\. Boot up Left 4 Dead. Make sure you have enabled developer console in options. Press “`” and type “map de_dust”. Viola, there you go. Hope this helps.

It works in both single and multiplayer, so you can fight against friends, but let me stress again, in a broken and unbalanced way - you can in no way get a feel for the real thing with this. Is this message clear enough? It’s nothing like proper Versus.