Alien Swarm: Reactive Drop

Alien Swarm
Alien Swarm	2010
Alien Swarm: Reactive Drop	2017

Alien Swarm: Reactive Drop is a multiplayer bird's-eye view action and shooter game in the Alien Swarm series.

General information

Article on the official Valve Developer Community wiki

Steam Community Discussions

Availability

Source	DRM	Notes	Keys	OS
Steam		Can launch without Steam, but it will give a "No Steam" error in the menu, and it cannot be played without Steam running. The game does work without Steam with the Goldberg Steam Emulator, with working stats/levels.

Game data

Configuration file(s) location

System	Location
Windows	<path-to-game>\reactivedrop\cfg\^{[Note 1]}
Steam Play (Linux)	<SteamLibrary-folder>/steamapps/compatdata/563560/pfx/^{[Note 2]}

Save game cloud syncing

System	Native	Notes
Steam Cloud		Syncs save games and settings.

Video

Graphics feature	State	Notes
Widescreen resolution
Multi-monitor
Ultra-widescreen		21:9 resolutions are selectable under the 16:9 resolution options. Position of HUD elements is incorrect.
4K Ultra HD
Field of view (FOV)		Change using `"fov_desired"` in the game's developer console. Limited to between 20 and 75 degrees in third person and between 20 and 120 degrees in third person.
Windowed
Borderless fullscreen windowed
Anisotropic filtering (AF)
Anti-aliasing (AA)
Vertical sync (Vsync)
60 FPS and 120+ FPS		Capped to monitor refresh rate plus 1. Can use the console command `fps_max` to change the FPS limit; set to `0` for uncapped framerate.
High dynamic range display (HDR)		See the glossary page for potential alternatives.
Color blind mode		See the glossary page for potential alternatives.

Input

Keyboard and mouse	State	Notes
Remapping
Mouse sensitivity
Mouse acceleration
Mouse input in menus
Keyboard and mouse prompts
Mouse Y-axis inversion
Controller
Controller support		XInput only; Must be enabled in Options → Controller
Full controller support		Some menus require mouse input.
Controller remapping
Controller sensitivity		The `360controller_pc.cfg` file under `<path-to-game>\reactivedrop\cfg\` needs to be modified.
Controller Y-axis inversion

Controller types

XInput-compatible controllers
Xbox button prompts		If Steam Input API is enabled: it'll be listed as Xbox button prompts.
Impulse Trigger support

DirectInput-compatible controllers
Directinput button prompts

PlayStation controllers		DualShock 4, DualSense, DualSense Edge Supported via Steam Input API.
PlayStation button prompts		Listed as Sony button prompts.
Motion sensors support
Light bar support
Adaptive trigger support
DualSense haptic feedback support
Connection modes	Wired, Wireless (Bluetooth)

Nintendo controllers
Nintendo button prompts
Face button layout support
Motion sensors support
Connection modes

Other controller(s)		Both Nintendo Switch Pro Controller and Generic Gamepads are supported via Steam Input API.
Peripheral devices support
Additional button prompts		Listed as Nintendo button prompts.

Additional information
Controller hotplugging
Input prompt override		requires Steam Input API inorder to override the button icon. Controller Icon Set can selected within Settings > Controls or Advanced Settings (in-game)
Haptic feedback
Simultaneous controller+KB/M

Steam Input
Steam Input API support
Steam Input prompt modes		SIAPI Button Icons Auto-Detect glyphs (via Controller Icon Set option) will not work properly on some Controller Types within the Main Menu.^[1] Some button prompts images within the main menu are baked-in.
Steam Deck button prompts		Listed as Valve button prompts.
Steam Controller (1st gen) button prompts
Motion sensors support
Official controller preset(s)		Steam Deck config only.

Audio

Audio feature	State	Notes
Separate volume controls
Surround sound
Subtitles
Closed captions
Mute on focus lost
Royalty free audio		Uses music from Valve, Incompetech, and other streaming-safe sources.

Localizations

Language	UI	Audio	Sub	Notes
English
Simplified Chinese
Traditional Chinese				Incomplete translation.
Czech
Danish
Dutch
Finnish
French
German
Hungarian
Italian
Japanese
Korean
Norwegian
Polish				Very poor translation.
Portuguese
Romanian
Russian
Spanish
Swedish
Thai
Turkish
Ukrainian

Network

For more information, see the "Source Dedicated Server" section of our Source engine article.

Multiplayer types

Type	Players	Notes
Local play	32	Co-op, Versus Use Nucleus Co-op.
LAN play	32	Co-op, Versus 8 (Co-op) or 32 (Deathmatch) marines, up to 32 total including spectators
Online play	32	Co-op, Versus 8 (Co-op) or 32 (Deathmatch), up to 32 total including spectators

Connection types

Type	Native	Notes
Matchmaking		Lobby search
Peer-to-peer
Dedicated
Self-hosting
Direct IP		Open the console (`~`) and enter `connect` followed by the IP and port.

Ports

Protocol	Port(s) and/or port range(s)
TCP	27014-27050
UDP	1200, 27000-27015

Universal Plug and Play (UPnP) support status is unknown.

Other information

API

Technical specs	Supported	Notes
Direct3D	9.0c

Executable	32-bit	64-bit	Notes
Windows

Middleware

	Middleware	Notes
Physics	Havok Physics	Heavily modified variant.
Audio	Miles Sound System
Cutscenes	Bink Video	Mainly for menu backgrounds
Multiplayer	Steamworks

Console commands

Games running on the Source engine can utilize Source Engine Console Commands for various tasks.

Enabling the console in Source games^{[citation needed]}

Launch the game
From the main menu select Options
Select the Keyboard tab
Click the Advanced button
Check the box next to Enable developer console (~)
Click Apply

Notes

Press ~ to open the console.

Some commands may first require you enabling sv_cheats. You can do so with sv_cheats 1.

Many servers will not allow you to play with cheats enabled, or will disable them upon entering the server.

Users without a US keyboard could experience some problems.

Launch options

View this Steam Support Article regarding launch options as well as the relevant Valve Developer wiki page for further information and a list of useful Source engine launch options.

Enabling a launch parameter^{[citation needed]}
Find the game in your Steam Library Right-click the game name Select `Properties` Select `Set Launch Options...` Input your selected launch options and separate each command with a space Press `OK` Launch the game

System requirements

Windows
	Minimum
Operating system (OS)	XP
Processor (CPU)	Intel Pentium 4 3.0 GHz
System memory (RAM)	2 GB
Storage drive (HDD/SSD)	10 GB
Video card (GPU)	ATI Radeon X800 Nvidia GeForce 6600 or better 128 MB of VRAM DirectX 9.0 compatible Shader model 2.0 support

Notes

↑ When running this game without elevated privileges (Run as administrator option), write operations against a location below %PROGRAMFILES%, %PROGRAMDATA%, or %WINDIR% might be redirected to %LOCALAPPDATA%\VirtualStore on Windows Vista and later (more details).
↑
Notes regarding Steam Play (Linux) data:
- File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data.
- Games with Steam Cloud support may also store data in ~/.steam/steam/userdata/<user-id>/563560/.
- Use Wine's registry editor to access any Windows registry paths.
- The app ID (563560) may differ in some cases.
- Treat backslashes as forward slashes.
- See the glossary page for details on Windows data paths.

References

↑ Verified by User:Al2009man on 2024-11-21
Tested by using DualSense and Steam Controller. If using a PlayStation Controller: it'll show Steam Deck prompts in some menu UI events, while using a Steam Controller will show PlayStation prompts within the same Menu UI. Steam Deck is not affected by this, and it'll use the in-game button icons instead.

[gamedir-1] When running this game without elevated privileges (Run as administrator option), write operations against a location below %PROGRAMFILES%, %PROGRAMDATA%, or %WINDIR% might be redirected to %LOCALAPPDATA%\VirtualStore on Windows Vista and later (more details).

[Proton_path_note-2] Notes regarding Steam Play (Linux) data:
File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data.
Games with Steam Cloud support may also store data in ~/.steam/steam/userdata/<user-id>/563560/.
Use Wine's registry editor to access any Windows registry paths.
The app ID (563560) may differ in some cases.
Treat backslashes as forward slashes.
See the glossary page for details on Windows data paths.

[3] File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data.

[4] Games with Steam Cloud support may also store data in ~/.steam/steam/userdata/<user-id>/563560/.

[5] Use Wine's registry editor to access any Windows registry paths.

[6] The app ID (563560) may differ in some cases.

[7] Treat backslashes as forward slashes.

[8] See the glossary page for details on Windows data paths.

[3] Verified by User:Al2009man on 2024-11-21
Tested by using DualSense and Steam Controller. If using a PlayStation Controller: it'll show Steam Deck prompts in some menu UI events, while using a Steam Controller will show PlayStation prompts within the same Menu UI. Steam Deck is not affected by this, and it'll use the in-game button icons instead.

[Note 1]

[Note 2]

[1]

Developers

	Reactive Drop Team
Engines
	Source
Release dates
Windows	April 20, 2017
Taxonomy
Monetization	Freeware
Microtransactions	None
Modes	Multiplayer
Pacing	Real-time
Perspectives	Bird's-eye view
Controls	Direct control
Genres	Action, Shooter
Themes	Sci-fi
Series	Alien Swarm