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Swarm Mode

Swarm is a new way to enjoy L4D with more variety and challenge! You can team up with your friends or compete against them in Coop, Versus, Survival, or Survival Versus. You can also test your skills in the "Hardcore" campaign mode, where you only get 3 chances to complete the campaign. Swarm adds new elements to the game, such as "new" special infected abilities, corruption cards that affect the environment and enemies, and player cards that give you perks and bonuses.

Note that you can bind these commands in the console!
eg. bind x "say !ping"

!ping - Pings enemies and world
!cards - Displays card HUD
!shuffle - Shuffles current cards players can pick
!pick - Pick a player card [1-8]
!botpick - Pick a player card for all bots or a specific bot [name] [1-8]
!drop - Drop current in hand item
!dropammo - Drop ammo from current in hand primary weapon
!lives - Shows all current players number of lives
!hardcore - Switches to Hardcore mode
!autohidehud - Toggles HUD behavior from hiding when survivors leave start (default) or waiting until all survivors have cards
!togglehud - Forces HUD off
!togglecheckpointwarp - Toggle bot warping behavior when all player survivors are in the end saferoom
!english
!spanish
!russian
There are many bugs with localizations other than English. Some of these are due to the game and cannot be fixed to my knowledge.

3 Incaps
0 Random Bosses
Normal Hordes

2 Incaps
1 Random Boss
Larger Hordes

For more info on corruption cards see: https://github.com/MrFailzz/Swarm-Mode/tree/main#readme

Jaiz - Updated Swarm circle model
SyberianHusky - Updated Swarm circle model
Nescius - Updated ping function