Play OpenSA, a real-time strategy mod for OpenRA focused on controlling swarms of insects.
Non OpenRA Version
Play OpenSA, a real-time strategy game where players command insect armies across the landscape.
About Non OpenRA Version
OpenSA (SA stands for Swarm Assault) is a downloadable game mod that recreates the 1999 Swarm Assault real-time strategy game using the OpenRA engine. Players control swarms of ants, beetles, spiders, scorpions or wasps and produce units to conquer colonies, with no resources and no population cap.
It includes the original campaign with minor modifications plus extra custom missions, and supports singleplayer and LAN and online multiplayer. Downloads are listed for Windows, macOS and Linux, with support for any resolution.
Key features
- Control ant, beetle, spider, scorpion and wasp swarms
- Produce units directly without resources or population cap
- Play recreated original campaign with minor modifications
- Play LAN and online multiplayer matches
- Play extra custom missions beyond the campaign
- Run at any screen resolution
Best for: Players who want to play the 1999 Swarm Assault formula with modern resolution and multiplayer options.
Good for
- Recreates the full original campaign with additional custom missions
- Includes LAN and online multiplayer in addition to singleplayer
- Supports any resolution instead of the original 640x480 limit
Non OpenRA Version at a glance
- Website
- dzierzan.itch.io/opensa
- Category
- Gaming › Mods & Fan Projects
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS, Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Non OpenRA Version FAQ
What is OpenSA?
SA stands for Swarm Assault. It is a real-time strategy game mod built with the OpenRA engine that recreates the 1999 Swarm Assault game.
Do I need to collect resources or construct buildings?
No. The page states there are no resources and no population cap; you produce units and conquer other colonies.
Can I change unit stats myself?
Yes. The author confirms players can edit the .yaml files to change values including damage, build time, speed, HP and fire delay.
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