TF2's mercs haunt the Old World: RED vs BLU wars, a Spy who steals your friend's face and voice, Mann Co. gear.
Content Warning x Team Fortress 2. Dive into the Old World and find out the mercs got there first.
All nine mercs (plus the Sentry), each with its own attack and a weakness
RED vs BLU Both teams spawn. When they meet, they fight until one side dies or loses sight of the other. Badly hurt mercs yell "MEDIC!" and run to their Medic, and teammates come to help. Use the war to slip away, or stay and film it.
Mann Co. in the shop: Sandvich, Bonk! Atomic Punch, Jarate, Medi Gun.
TF2 map days: some dives land in 2Fort or Harvest Event, rebuilt at night. There, mercs are all but guaranteed and come in numbers.
Co-op for up to 4 through Content Warning's own lobbies.
You need both games. Everything from TF2 (models, animations, voice lines, sounds, icons, maps) is read live from your own TF2 install, and nothing from either game ships with the mod.
Voice clip for the Spy are cut on each player's own PC from the voice chat it already plays. They are kept in memory only, never saved or sent anywhere, and dropped when you leave the lobby. People you muted or blocked are left out.