Check out the trailer for the new Killing Floor DLC End of the Line. The game provides co-op zombie-killing for up to six players at a time, with unlockable persistent perks to level up your character.

The Developer’s Map Pack will add in two new Wave Mode maps, the medieval castle-based “Stronghold” and the abandoned snowy town of “Siren’s Belch.” It will also throw in the objective map “Transit,” which will bring the horror action to an underground subway area.

Paid content will include new Neon Characters and Neon Weapons packs, which will decorate some of the game’s weapons and characters in keen Tron-like colors.

The End of the Line update will be ready for all players before the end of Wednesday. For those that have not gotten into the Killing Floor phenomenon, the game will be available for $4.99 on Steam through July 15.