L4D2 Mission Files

Left 4 Dead 2 mission files are metadata scripts that describes the structure and content of a campaign. They are used by the game UI, matchmaking, and the game server.

Mission files are .txt files that are stored in the missions directory, for example left4dead2\addons\deadline2\missions\mycampaign.txt. It is strongly recommended that the file is given an unique name to avoid conflicts with other campaigns.

Official mission files can be found in List of L4D2 Missions Files and Deadline_Mission_File

Debugging

To debug mission files the game needs to be started with the -allowdebug command line option. Running the mission_reload console command will attempt to load all mission files, and will print information about any errors encountered.

Base Mission File

This is the most bare bones mission file, containing only the things you need.

 "mission"
 {
 	"Name"		"myCampaign"	//For matchmaking system. Only letters A-Z and Numbers 0-9 allowed.
  	"Version"	"1"		//For matchmaking system. Only Numbers 0-9 allowed.
 
 	// Main Menu representation of Campaign.
 	"DisplayTitle"	"My Campaign!"
 	"Description"	"An epic tale of zombies getting shot in the head."
 	"Author"	"Me!"
 
 	// Where to download the campaign. Seen by people trying to join a server playing this campaign. Not required for workshop submissions.
 	"Website"	"http://media.steampowered.com/apps/513/deadline2.html"
 
 	// VMT shown behind the end credits when your campaign ends. MUST have "vgui/" at the front.
 	"OuttroImage"	"vgui/outroTitle_DeadCenter"
 
 	// A list of melee weapons that are allowed to spawn in the campaign. 
 	// Custom melee weapons can be added by using the melee weapon script name in this list, such as "My_custom_melee.txt" at the end of this string.
 	"meleeweapons"	"baseball_bat;cricket_bat;crowbar;electric_guitar;fireaxe;frying_pan;golfclub;katana;knife;machete;pitchfork;shovel;tonfa;My_custom_melee" //these are all official melee weapon, plus one extra.
 
 	// Which set of survivors should be used. 1 for L4D1, 2 for L4D2
 	"survivor_set"		"2"	
 	
 	// Other options. 0 = Off, 1 = on. 
 	"allow_cola"		"0"	// Allows the Dead Center cola bottles to spawn.
 	"no_wpn_restore"	"0"	// On player wipe, don't keep any weapons.
 	"no_female_boomers"	"0"	// Disables spawning of the Boomette.
 	"no_cs_weapons"		"0"	// Disables spawning of the German version CS weapons. AS of the "The LAst Stand" Css weapons are available for every version of the game. It is unsure if this strinng is still in use.
 	"allow_diesel"		"0"	// Allows the Hard Rain Diesel cans to be used.
 
 	// Loading screen poster settings.
 	"poster"
 	{
 		// Loadingscreen. VMT must be placed in "materials/vgui/"
 		"posterImage"		        "LoadingScreen_MyCampaign"
 		"posterImage_widescreen"	"LoadingScreen_MyCampaign_widescreen" // Optional widescreen version. For 16:9 and 16:10 aspect ratios.
 		"fullscreen"			"1" // Fitts loading screen onto entire screen, resizing it if required.  		
 		"l4d2_names"			"1" // Use L4D2 survivor names on loadingscreen or not. "survivor_set" already handles this, making this seemingly useless.		
 		"character_order"		"coach;mechanic;gambler;producer"  //Order in which survivors appear on the bottom left of loadingscreen
 		//"character_order"		"biker;manager;teengirl;namvet"  //Ditto, but L4D1 names.		
 	}  
 	"modes"
 	{
 		"coop" //Co-Op Game mode. 
 		{
 			"1"
 			{
 				"Map"		"my_map1" // BSP file name, without extension
 				"DisplayName"	"Map 1!" //Name seen on menu
 				"Image"		"maps/my_map1" //Thumbnail VMT file, must be saved in "materials\vgui\maps"
 			}
 
 		//	Additional maps listed here, make sure to number them correctly.
 		//	"2"
 		//	{
 		//		"Map"		 "my_map2"
 		//		"DisplayName"	 "Map 2!"
 		//		"Image"		 "maps/my_map2"
 		//	}			
 		}
 	}
 }

Game Modes

The "modes" section defines what Game Modes your map(s) support. You may reuse the same bsp for multiple gamemodes, if it was compiled to allow it. See Multi Game Mode Support, Survival Gametype, Scavenge Maps and Mutation Gametype for more info.

All maps must be listed in chronological order, but it does not matter which game mode is listed first. Example:

 "modes"
 {
 	  "coop"
 	  {
 		  "1"
 		  {
 			"Map"		"my_map1"
 			"DisplayName"	"Map 1!"
 			"Image"		"maps/my_map1" 
 		  }			
 		  "2"
 		  {
 			"Map"		"my_map2"
 			"DisplayName"	"Map 2!"
 			"Image"		"maps/my_map2" 
 		  }			
 	  }
 
 	  "versus"
 	  {
 		  "1"
 		  {
 			"Map"		"my_map1"
 			"DisplayName"	"Map 1!"
 			"Image"		"maps/my_map1" 
 			"VersusCompletionScore"	"800" //This map awards max 800 points to the score when the saferoom is reached.
  		  }			
 		  "2"
 		  {
 			"Map"		"my_map2"
 			"DisplayName"	"Map 2!"
 			"Image"		"maps/my_map2"  
 			"VersusCompletionScore"	"1000" //This map is longer and rewards 1000 points.
  		  }			
 	  }
 
 	  "survival"
 	  {
 		  "1"
 		  {
 			// Uses my_map2.bsp, but because it is the first map in survival mode, it is listed as number 1.
 			"Map"		"my_map2"
 			"DisplayName"	"Parking Lot" //Fancy name because the survival play area is just the parking lot.
 			"Image"		"maps/my_map2" 
 		  }			
 	  }
 }

Available Game Modes

These are all available gamemodes. Also showing what gamemode a mutation is based on.
This Left4Dead fan wikipedia page explains what each of those mutations do.

Script name	Official name	Base
Coop	-	-
Realism	-	-
Survival	-	-
Versus	-	-
Scavenge	-	-
Dash	-	-
Holdout	-	-
Shootzones	-	-
Gunbrain	GunBrain	Coop
Tankrun	Tank Run	Coop
Rocketdude	RocketDude	Coop
L4d1	Left 4 Dead 1 Coop	Coop
L4d1vs	Left 4 Dead 1 Versus	Versus
L4d1survival	Left 4 Dead 1 Survival	Survival
Mutation1	Last Man On Earth	Coop
Mutation2	Headshot!	Coop
Mutation3	Bleed Out	Coop
Mutation4	Hard Eight	Coop
Mutation5	Four Swordsmen	Coop
Mutation7	Chainsaw Massacre	Coop
Mutation8	Ironman	Coop
Mutation9	Last Gnome On Earth	Coop
Mutation10	Room For One	Coop
Mutation11	Healthpackalypse!	Versus
Mutation12	Realism Versus	Versus
Mutation13	Follow the Liter	Scavenge
Mutation14	Gib Fest	Coop
Mutation15	Versus Survival	Survival
Mutation16	Hunting Party	Coop
Mutation17	Lone Gunman	Coop
Mutation18	Bleed Out Versus	Versus
Mutation19	Taaannnkk!	Versus
Mutation20	Healing Gnome	Coop
Community1	Special Delivery	Coop
Community2	Flu Season	Coop
Community3	Riding My Survivor	Versus
Community4	Nightmare	Survival
Community5	Death's Door	Coop
Community6	Confogl	Versus

Mutations will automatically inherit map settings of whatever game mode the mutation is based on. unless otherwise specified
Example:

 "Versus"
 {
 	"1"
 	{
 		"Map"		"my_map1"
 		"DisplayName"	"Map 1!"
 		"Image"		"maps/my_map1" 
 		"VersusCompletionScore"	"800"
 		"versus_boss_spawning"
 		{
 			"tank_chance"		"1"
 			"witch_chance"		"1"
 		}
 	}			
 }
 "Mutation18" // Bleed Out Versus. Same as regular Versus, but with halfed Tank and Witch spawn chance to make it easier for survivors.
 {
 	"1"
 	{
 		"Map"		"my_map1"
 		"DisplayName"	"Map 1!"
 		"Image"		"maps/my_map1" 
 		"VersusCompletionScore"	"800"
 		"versus_boss_spawning"
 		{
 			"tank_chance"		"0.5"
 			"witch_chance"		"0.5"
 		}
 	}			
 }

Optional Per-Map Settings

The following settings can be added to any map listing in the missionfile, to make the settings only affect that specific map.

Revisiting maps

Some maps, like in Hard Rain can be "Revisited". This allows you to keep all existing item spawns in the same locations, but all the ones you had used are now gone on the way back.
This only works if the items in both maps are in the exact same location, with same orientation. This can be achieved by using the same vmf as base for both maps, but the saferooms being reversed on the "way back", along with optional visual changes.
Example:

 "1"
 {
   "Map"		"my_map1" 
   "DisplayName"	"Map 1!"
   "Image"		"maps/my_map1"
 	
   "revisitable" "1" // Keep track of all used items on this map. We'll be coming back to this one.
 }
 
 "2"
 {
   "Map"		"my_map2" 
   "DisplayName"	"Map 2!"
   "Image"		"maps/my_map2"
 
   "revisit_source" "my_map1" // We're back, but going the other way. All items osed on the here specified maps will no longer be available.
 }

Todo: Find out if it is possible to chain revisits. As in one "hub" map with tons of supplies, which start to dwindle as we progress.

Swapping Special Infected Models

We have the ability to swap all Special Infected on a map with the same different model. This is mostly used to make use of the L4D1 versions of the Boomer, Hunter, Smoker and Tank.

Swapping all tanks to "Sacrifice" Train Car tank

 "TankVariant"		"models/infected/hulk_dlc3.mdl"
 "TankArmsVariant"	"models/v_models/weapons/v_claw_hulk_dlc3.mdl"

Using L4D1 SI

 "TankVariant" 		"models/infected/hulk_l4d1.mdl"         
 "HunterVariant" 	"models/infected/hunter_l4d1.mdl"
 "SmokerVariant" 	"models/infected/smoker_l4d1.mdl"
 "BoomerVariant"	"models/infected/boomer_l4d1.mdl"
 "TankArmsVariant"	"models/v_models/weapons/v_claw_hulk_L4D1.mdl"     
 "HunterArmsVariant"	"models/v_models/weapons/v_claw_hunter_l4d1.mdl"
 "SmokerArmsVariant"	"models/v_models/weapons/v_claw_smoker_l4d1.mdl"
 "BoomerArmsVariant"	"models/v_models/weapons/v_claw_boomer_l4d1.mdl"

Using Bride Witch

 "WitchVariant"	"models/infected/witch_bride.mdl"

Todo: Are other options such as "SpitterVariant" also possible?

Versus map settings

Versus maps allow optional modifications to alter the spawning of bosses.

 "versus_boss_spawning"
 {

"spawn_pos_min" "0.10" //

Todo: Properly document effects of this

"spawn_pos_max" "0.90" //

Todo: Properly document effects of this

"allow_boss_mix" "1" //

Todo: Properly document effects of this

"witch_and_tank" "1"//

Todo: Properly document effects of this

	"tank_chance"		"1.0" // tank spawn chance multiplier. can be set to 0 to stop tank spawns
 	"witch_chance"		"1.0" // witch spawn chance multiplier. can be set to 0 to stop witch spawns
 }

See also

• L4D 2 Campaign Add-on Tutorial
• List of L4D2 Missions Files