Xenocide is a fan-made, open-source remake of the classic strategy game X-COM: UFO Defense (also known as UFO: Enemy Unknown). Originally built with C# and Microsoft XNA Game Studio 3.0 (~2007–2010), the project has been migrated to MonoGame for modern cross-platform support (Windows + Linux).

• Real-time 3D globe with time acceleration controls
• Base management — 17 facility types (storage, scan, defense, special) on a grid floorplan
• Aircraft interception — launch fighters with weapon pods to engage UFOs
• Research tree — XML-defined prerequisites and unlocks (items, facilities, X-Net entries)
• Manufacturing — build equipment in workshops with engineers
• X-Net encyclopedia — in-game database of researched technologies
• Funding model — monthly country-by-country support based on performance
• Alien AI — 3-layer strategic system: Overmind (monthly planning), InvasionTask (mission coordination), Craft (HFSM behaviors)

• Turn-based squad combat on tile-based 3D maps
• Teams: X-Corp, Aliens, Civilians
• Cell-based terrain with line-of-sight, cover, and height mechanics
• 6 hit locations (head, body, arms, legs) with armor front/side/rear values
• Fatal wounds system with medkit healing
• Experience and stat advancement for soldiers
• A* pathfinding with flyer/non-flyer support
• Combatant AI and team-level tactical AI
• Procedural terrain generation

• Interceptor-vs-UFO air combat (partially implemented)

• Display options (resolution, fullscreen, software/hardware cursor)
• Sound options (music/SFX volume)
• Notification and gameplay settings

• .NET SDK 9.0+ — download
• MonoGame templates and MGCB tools:

  dotnet new install MonoGame.Templates.CSharp
  dotnet tool install -g dotnet-mgcb
  dotnet tool install -g dotnet-mgcb-editor

dotnet run --project src/Xenocide.MonoGame

The MGCB content pipeline compiles .fbx models, .fx shaders, textures, spritefonts, and .ogg audio into .xnb format at build time.

MIGRATION.md             — Migration plan and roadmap
docs/
  LOGGING.md             — Logging architecture documentation
assets/                  — Artwork, design documents, sounds, historical installers
xna/                     — Main source code
  trunk/
    Xenocide.MonoGame/   — MonoGame target (active development)
      Source/
        Audio/           — GameAudioComponent (MonoGame SoundEffect backend)
        Model/           — Game state, geoscape, battlescape, static data
        Services/        — Savegame service
        UI/
          Controls/      — Toast notifications, software cursor
          Dialogs/       — 13 modal dialogs (4 with Gum .gusx layouts)
          Scenes/        — 3D scenes (Geoscape, Battlescape, XNet, Facilities)
          Screens/       — 27 game screens (Gum-based with .gusx layouts)
        Utils/           — NLog logging, profiling, serialization, content cache
      Content/           — MGCB assets (models, shaders, textures, fonts, audio)
        Gum/             — Gum .gumx project + .gusx screen/dialog layouts
    Tests/               — xUnit.net unit tests
LICENSE                  — MIT License

The original XNA 3.0 build required deprecated tooling (Visual Studio 2008, XNA Game Studio 3.0, .NET Framework 2.0). It has been superseded by the MonoGame port.

• YT: Project Xenocide 2007 Progress Update, by SupSuper
• StrategyCore: Home > Databank > Projects > Xenocide

Licensed under the MIT License. Copyright © 2010 Project Xenocide team.