Kill everything that moves.
Deathmatch is the only competitive campaign included in Alien Swarm: Reactive Drop. Unlike the other campaigns, missions in this campaign do not have conventional objectives - rather, a win condition is set based on the type of Deathmatch chosen.
- Killing an Aliens doesn't count as score.
- Aliens can spawn on first and second map when Onslaught activated.
- Several sound effect are taken from another video games.
- The Kill-Streak Announcer taken from Unreal Tournament 2004.
- The round complete taken from Counter-Strike: Global Offensive.