many improvements to map 4:

-added a spark effect to the crashed semi and adjusted the position of the ceiling lights in the first storage room
-added some pictures, a clock, the saferoom door frames and the missing bedside lamp to the final safehouse
-placed the 2 decals in the starting saferoom that were also added in the previous map
-properly mirrored the stadium stands when looking back towards the previous map
-added the missing clip brushes, blood, flies and fly sounds to all corpses
-also added the missing books and other physics props to all shelves
-added in lots of missing ammo upgrade and laser sight spawns
-added some new trash and stain decals to the streets
-added the missing clip brushes to all luggage piles
-downsized the skybox for better optimization
-decreased the spawnrate of most items
-a few tweaks to the navmesh

many improvements to map 3:

-fixed survivors trying to walk through the tank event door in the stadium while it's still closed
-removed some sections of glass railing in the stadium for better infected navigation
-re-centered the entire map in the void for better performance
-placed some new decals on the floor of the ending saferoom
-added the missing blood, flies and fly sounds to all corpses
-moved around and added a few props for a cleaner layout
-improved the downed helicopter wreckage on the field
-fixed mudman spawning inside the stadium and field
-added many new physics props to empty shelves
-downsized the skybox for better optimization
-completely remade the map's navmesh
-added many new infected ladders
-shortened the map very slightly

-fixed a section of invisible fence that was introduced in the last update of map 2

many new improvements to map 1 and 2:

-added a few new CEDA signs and other graffiti overlays to a few empty walls
-made pipe bombs and molotovs spawn less frequently in map 2
-moved around and added a few new props for a cleaner layout
-swapped out the library fence for a more fitting L4D1 version
-fixed defibrillators not spawning in map 2 as well
-many fixes to the navigation meshes
-added a few new infected ladders

-re-added missing cubemaps to the current version of map 1

many improvements to map 1:

-moved a super early rescue closet from the underground to the building after the crane crescendo
-swapped out 2 of the infected models from the intro because they wouldn't illuminate properly
-added tons of new physics props to all of the shelves that were missing them
-added some new props to the bare sides of a few buildings
-added lots of new quality of life clip brushes throughout
-many fixes and improvements to the navigation mesh
-added some new infected ladders to a few buildings
-fixed some power lines not blowing in the wind

-fixed some skybox poking through near the end of the level in map 2

many improvements to map 2:

-added lots of new clip brushes to prevent survivors from getting out of bounds
-made the first aid cabinet spawn with 4 kits instead of 2 in the last saferoom
-fixed bot survivors not picking up first aid kits in the starting saferoom
-fixed many navigation mesh areas

also fixed the same first aid cabinet in the beginning of map 3

many improvements to map 1:

-fixed the incorrect detailsprites on some grass textures
-made the way forward a bit more clear in the box store
-many improvements to the navigation mesh
-added many new infected ladders

-added the new re-designed campaign poster, background and outro credit image for the campaign, courtesy of SirWololo!