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Alien Swarm: Reactive Drop News

Mapping Competition 2024: "Space Station"

It's Alien Swarm: Reactive Drop's 7th birthday, which means it's time for our second annual mapping competition!

The theme this year is Space Station. Create a standalone mission (of any type) that takes place on a space station or other large spaceship. Here are some ideas to get you started:

  • A deathmatch mission with hazards that can be activated via panels scattered around the ship.
  • An endless mission where civilians must be rescued from a derelict space station while keeping life support active.
  • A mission where marines must fight their way through enemy soldiers to stop the ship's reactor from melting down.
  • A mission where marines clear out a space station that is still being affected by the portal storms that preceded the seven hour war, full of warring Xen creatures.
  • A mission where marines need to download critical data from computers on a space station that is actively falling apart.
  • A mission where marines investigate the ruins of a space station that has reentered the atmosphere of a planet and crashed.


Missions can be submitted via the Steam Workshop using the SpaceStation2024 tag between now and June 1st, 2024 at 00:00 UTC.

Entering will earn you a medal unique to this contest once submissions close, and the winning entry will receive an additional medal unique to that entry. High quality entries may also be featured in Heroes of the Interstellar Armed Forces.

Alien Swarm: Reactive Drop's 7th Birthday

It's Alien Swarm: Reactive Drop's 7th birthday, and that means a week of double experience points from missions, our second annual mapping competition, and the possibility of cake.

[h2]2023 in Review[/h2]

Since Alien Swarm: Reactive Drop's 6th birthday last year, the game has gained improved shaders, better weapon readability, additions to Heroes of the Interstellar Armed Forces including mission bounties, better lag compensation, and an in-game reporting system. You might also notice some changes to the main menu if you haven't played for a while.

In April 2023, we started tracking the causes of marine deaths, and between April and December, 12,734,965 marines died in missions. The most common cause of death? Good old drone claws, with 5,147,736 confirmed kills.

Other interesting deaths in 2023, selected at random:

  • 194,240 marines died to self-inflicted damage in deathmatch game modes.
  • 30,097 marines were kicked to death by boomers.
  • 6,136 marines were run over by a rogue forklift in Lab Ruins.
  • 18,857 marines were blown up along with a destroyed sentry.
  • 929,538 marines were lost to infestation. 113,511 marines were shot to death while infested.
  • 346,432 marines were blown up by grenades fired from a grenade launcher, and an additional 962,861 marines were blown up by grenades fired by their own grenade launcher.


Marines aren't the only ones who die in Alien Swarm: Reactive Drop missions! In 2023, player-controlled marines killed:

  • 1,156,620,313 (that's right, over a billion) drones.
  • 59,404,675 parasites.
  • 51,839,565 xenomites.
  • 31,888,835 rangers.
  • 30,038,781 eggs.
  • 28,923,205 buzzers.
  • 20,908,814 grubs.
  • 6,392,125 biomass.
  • 6,199,796 boomers.
  • 5,692,301 harvesters.
  • 4,105,397 menders.
  • 4,012,723 shieldbugs.
  • 3,534,646 mortarbugs.
  • 29,210 queens.
  • 2,208,733 antlions.
  • 254,967 zombies.
  • 176,539 headcrabs.
  • 190,592 Combine soldiers.
  • 18,187 hunters.


In 2023, you completed 7,489,163 missions... and failed 14,054,778 missions. After the November 2023 update added support for duplicate marines in custom game modes, you completed 3,890 missions with 9 or more player-controlled marines (39,932 missions if we count each player separately like we do for other stats) in November and December.

[h2]Mapping Competition 2024: "Space Station"[/h2]

This year's theme is "Space Station". See the announcement of the contest for more details.

[h2]Changes in this update[/h2]

[h3]Weapons[/h3]
  • Weapons (other than the M868 Flamer Unit and the Grenade Launcher) in first person now fire from the center of the camera, similar to how other first person games work.
  • M868 Flamer Unit: Fixed the firing animation continuing to play on the client after running out of ammo if the fire button is held and auto-reload is disabled.
  • Grenade Launcher: The friendly fire crosshair is now activated based on the grenade's predicted location of impact instead of pretending the grenade launcher shoots bullets.
  • Grenade Launcher: Fixed the grenade launcher attempting to aim for the inside of the marine's head in first person.


[h3]Official Missions[/h3]
  • Area 9800: Power Plant's Generator: Fixed a collapsed metal support sometimes blocking the path.
  • Tears for Tarnor: Oasis Colony Spaceport: Fixed the train seating's physics model pushing things in another room.
  • Paranoia: High Tension: Fixed a location where it was possible to fall through the ground.
  • Nam Humanum: Groundwork Labs: Fixed an explosive barrel being able to be pushed away from the panel it is intended to destroy.
  • Nam Humanum: Groundwork Labs: Fixed a stutter near the start of the mission.
  • BioGen Corporation: Operation X5: Removed some physics props that aliens could get stuck on during the finale.
  • BioGen Corporation: Invisible Threat: Fixed unexpected aiming behavior near the fan caused by out of bounds geometry.
  • Accident 32: Research Center: Reduced the amount of parasites and drones in this mission.
  • Accident 32: Confined Facility: Made the drop into the sewers more intuitive.
  • Accident 32: Confined Facility: Improved visibility in the area under the glass near the start.
  • Accident 32: Confined Facility: Reduced the health of a door on an alternate path to make it more viable.
  • Accident 32: Lab Ruins: Changed the indicator lights on the panels in the final encounter from green to blue to make them easier to see with the lighting.
  • Space Port Catastrophe: Removed some invisible geometry above a doorway near the end of the map.


[h3]Infection Deathmatch Challenge[/h3]
  • Humans are now slower than Zombies.
  • Increased Last Stand health bonus.
  • Fixed a bug that caused only one Prime Zombie to spawn at the start of the round when the requirements were met to spawn two.


[h3]Technical[/h3]
  • Fixed addons that are subscribed but disabled through either the in-game addon menu or the Steam properties window not being loaded when required by a challenge.
  • Fixed dedicated servers spawning more IO threads than intended. Dedicated servers now spawn 3 IO threads rather than one per core with no limit (or 0 as before if -noasync is passed on the command line). The client keeps the behavior it has had since 2018, spawning an IO thread per processor core up to a maximum of 3.
  • Fixed an issue causing reports to not contain the reported player's ID in the intended format. A workaround is in place on the server, so no reports made after March 2nd are affected.
  • Reworked the way that inventory items are sent to the game server. For now, this just means that medals should show up faster when you load into a lobby.
  • Marked func_breakdmg_bullet, func_breakdmg_club, and func_breakdmg_explosive as cheats.
  • Fixed the Swarmopedia unlock message showing gibberish instead of the name of the alien.
  • Added a message in chat when a player receives a medal for completing an achievement or other in-mission task.

Alien Swarm: Reactive Drop Hotfix - March 6, 2024

We've updated the game client with a fix for bug reports written in Chinese only sending the first half of the text.

Alien Swarm: Reactive Drop Hotfix - March 1, 2024

We've fixed a few issues reported by the community.
  • Fixed a crash on the main menu when hovering over the public lobby list or list of friends.
  • The Season 20 Heroes of the Interstellar Armed Forces medals were given out with the wrong numbers. These have been revoked and re-issued.
  • Fixed the Report a Problem text box only allowing English letters.
  • Fixed the Maximum Game Bandwidth setting showing the number in kilobytes per second while the description said kilobits.
  • Added an icon to the main menu that can be used to access the legacy server browser.


Additionally, some late notes for the release earlier today:
  • Tears for Tarnor: Oasis Colony Spaceport: Made auto-aim target Fred (the colonist who dies at the beginning) to keep a speedrunning trick working.
  • Reduction: Fallen City: The box car door no longer collides with aliens and physics objects.
  • Fixed the chainsaw idle sound starting after having fired the chainsaw when rd_chainsaw_idle_sound is 0.

Alien Swarm: Reactive Drop Update - March 1, 2024

Next month (April) is Alien Swarm: Reactive Drop's 7th anniversary. We're not planning on having a huge update this year because we've decided it's better to release new content as soon as it's ready instead of waiting for an arbitrary time of year. March (this month) brings with it some new menus, fixes for various problems reported by the community, and some updates to an infrequently used NPC for mappers.

[h2]Reporting[/h2]
  • Added a button to quickly report or commend players in the player list (by default, F9, or the thumbs-up icon in the lobby). Reports go to the Reactive Drop Team.
  • Added a new option to the pause (ESC) menu: "Report a Problem".
  • Entering the pause menu now takes a screenshot that can be attached to the report.
  • This feature can be used for anything you think the Reactive Drop Team should know about. (Let us know through some other method if you get errors sending a report.)
  • Once a report is started, you can resume the report at any time until you close the game, or throw it away and start a new one.
  • You can start a report on any player you played with or the last dedicated server you were on for up to an hour afterwards.
  • You can also file a report that is not tied to a player or server (for example, a bug report or asking for help with a problem related to your account) at any time.
  • Fixed the "Automatically report players I mute or vote for" checkbox on the player list always appearing to be unchecked when the menu loads.


[h2]Deathmatch[/h2]
  • Infection Deathmatch Challenge: Prevented Onslaught from being activated in these modes.
  • Infection Deathmatch Challenge: The railgun now pushes zombies with much more force.
  • Heroes of the Interstellar Armed Forces servers no longer filter deathmatch challenges.


[h2]Colonists (for mappers)[/h2]
  • Colonists are no longer an auto-aim target by default. (Can be adjusted in Hammer.)
  • Colonists now show the friendly fire warning on the crosshair unless they are marked as an aim target.
  • The colonist behavior that makes them follow marines when interacted with can now be disabled in Hammer, and the colonist now has a glowing outline to indicate that this action is allowed.
  • Added "spawn with weapon" option for colonists in Hammer. However, many weapons act strangely with colonists; this will be addressed in the future based on what mappers need.
  • Combine soldiers now use asw_weapon_pdw_single rather than being hard-coded to use a custom model and animations. asw_weapon_pdw_single becomes an asw_weapon_pdw with special settings once it spawns, so scripts that manipulate asw_weapon_pdw do not need to be updated.
  • Colonists now support ai_goal_actbusy. All Half-Life 2 citizen busy actions are available.
  • Additionally, Drone_WallPound and Ranger_Sleep busy actions are now available.
  • Aliens now make "sounds" that humanoid NPCs can hear whenever they complete or loop an animation.


[h2]Other Bug Fixes and Tweaks[/h2]
  • Jacob's Rest: Cargo Elevator (all variants): Fixed some graphical oddities based on camera position on the metal plating after the toxic pit.
  • cl_lagcompensation can now be changed while connected to a server.
  • Fixed choppy animations for eggs.
  • Fixed computers sending an extra OnComputerHackCompleted output after the download is completed if asw_simple_hacking is enabled.
  • Fixed a main menu crash when cl_quick_join_scroll_max is 0 and rd_reduce_motion is 1.
  • Fixed a performance hitch when sending equipped inventory items (such as medals) to a server.
  • Removed some console warning messages that the game's Steam Input support code could show in non-error cases.
  • When running rd_steam_input_disable, the game now turns XInput support back on for every attached controller.
  • Changed the color for voice-muted players from gray to red to make it easier to differentiate them from non-speaking players, which were a different gray.
  • Removed a spammy server log message that could be triggered by alt-tabbing.
  • Lag compensation no longer runs for spectators.