- Project Reclaimer is an independent fan project that reverse engineers Halo 3 PC gameplay via your Steam copy of MCC
- AI in Forge: place Halo 3 campaign enemies, vehicles, and squads in multiplayer maps
- Scale: up to 128 players per match and 16-player campaign co-op
- No file replacement: the standalone client runs beside MCC without modifying original game files
- Status: Early Development — not affiliated with Microsoft, Xbox Game Studios, Halo Studios, or Bungie
What Project Reclaimer Actually Is
Project Reclaimer is a reverse engineered AI game experience built on top of Halo 3 PC. It is a standalone fan-made launcher for players who own the Steam edition of Halo: The Master Chief Collection. Instead of launching MCC and navigating its menus, you launch the Project Reclaimer client directly, browse community servers, and join sessions that can range from classic Slayer to heavily modded, AI-driven encounters.
The phrase "reverse engineered AI game" describes the project's core approach: the developers have rebuilt the systems around Halo 3's simulation — enemies, pathing, vehicles, and scripting — so that campaign AI can exist in multiplayer environments, Forge maps, and custom modes. The official site lists the headline features:
| Feature | What It Delivers | Notes |
|---|---|---|
| Server browser | Filter and join community servers directly | No MCC menu required |
| Dedicated servers | Persistent hosting with up to 127 slots | Windows, Windows Server, Linux Docker |
| Expanded Forge | Frozen-object editing, larger builds, AI placement | STOCK, BUILT-IN, and MOD object sources |
| Campaign co-op | Up to 16 players, mid-session joining | Supports campaign mods |
| Custom modes | Scripted modes via Megalo and JSON | Gun Game, Flood Infection, and more |
| Mod distribution | Steam Workshop plus server-side auto-download | Missing files fetched on join |
Project Reclaimer is not an official product of Microsoft, Xbox Game Studios, Halo Studios, or Bungie. It requires you to own the Steam version of Halo: The Master Chief Collection, and it does not distribute the base game.
The Reverse Engineering Approach: How AI Enters Multiplayer
Traditional Halo 3 multiplayer had no campaign AI — enemies only existed in the campaign sandbox. Project Reclaimer's reverse engineering work unlocks that sandbox for multiplayer and Forge use, which is what turns a standard Halo 3 session into something closer to a sandbox "AI game" where creators script their own encounters.
Game files are read, not replaced
The client uses your existing MCC installation as its content source. Original game files remain untouched, which keeps your Steam install intact.
Simulation systems are extended
Enemy AI, vehicle behavior, and squad logic from Halo 3's campaign are exposed to multiplayer maps and Forge sessions.
Creators place AI in Forge
The expanded Forge editor lets builders add enemies, vehicles, and trigger-based encounters, mixing STOCK objects with BUILT-IN and MOD content.
Scripts control the behavior
Megalo scripts and JSON configuration define how AI encounters, objectives, timers, zones, and rounds play out during a live match.
Servers distribute everything
When players join, missing maps and mods download automatically from the server or Steam Workshop.
AI in Forge
- Campaign enemies and vehicles in multiplayer maps
- Encounter and route testing
- Mixed STOCK / MOD object sources
Scripted Logic
- Megalo rules and events
- JSON configuration layer
- Timers, zones, HUD, round control
Server Sharing
- Automatic missing-file download
- Steam Workshop support
- Synchronized dependencies for all players
Change one gameplay variable at a time when testing AI encounters. Testing AI routes, spawn logic, and objectives independently makes unexpected behavior far easier to diagnose.
Core Gameplay Systems Compared
The following tables summarize how the major systems work together and what each one means for players and creators.
| System | Player Experience | Creator Controls | Difficulty to Learn |
|---|---|---|---|
| Server browser | Filter by map, mode, version, latency, mods | Advertise sessions on dedicated servers | ★☆☆☆☆ |
| Standard multiplayer | Up to 128 players, Slayer, CTF, Oddball | Mode and map rotation config | ★☆☆☆☆ |
| Expanded Forge | Play community-built arenas | Object placement, AI, frozen-object editing | ★★★☆☆ |
| Campaign co-op | Solo, split-screen, or 16-player online | Mission, difficulty, starting point, modifiers | ★★☆☆☆ |
| Scripted modes | Gun Game, Growth, One in the Chamber, Zone Control, Flood Infection | Megalo logic, JSON settings | ★★★★☆ |
| Scripted Mode | Category | Core Loop |
|---|---|---|
| Gun Game | Progression | Advance through a weapon sequence as you earn eliminations |
| Growth | Player-state | Power or status scales as the match progresses |
| One in the Chamber | Limited ammo | Careful engagements; eliminations restore resources |
| Zone Control | Objective | Capture and hold zones to convert control into score |
| Flood Infection | Infection | Humans vs Flood roles; infection events change match state |
New creators should begin with a Slayer-style foundation in Megalo, add one variable or rule at a time, and test each rule independently before combining systems. The built-in scripted modes double as reference implementations.
Setup and Hosting Pathways
Getting into Project Reclaimer follows a short path, and hosting a persistent server follows a longer one. The table below maps the three main roles.
| Role | What You Install | Main Tasks | Best For |
|---|---|---|---|
| Player | Client only | Install MCC content, set nickname, join servers | Casual and competitive play |
| Server operator | Client + dedicated server package | Configure ports, maps, mods, restarts | Community hosting |
| Administrator | RCON tool | Remote commands, player management, bans | Unattended server operation |
Install the required Halo content
Install Halo: The Master Chief Collection through Steam, including the Halo 3 Campaign and/or Multiplayer content your target servers require.
Download the Project Reclaimer client
Get the latest release from the official releases page and place it in its own directory, separate from MCC.
Launch and name your account
Start the client directly — no MCC menu needed — and set the nickname friends and admins will see.
Browse and join a server
Filter by map, game type, version, or latency, then join. Accept any prompted content downloads and reconnect if requested.
Before opening a server to the public: allow required ports through your firewall, forward ports if behind NAT, configure the administrator list, enable anti-cheat protections, and set a strong RCON password.
Goals for New Community Members
Essential Milestones:
- Install MCC with Halo 3 content and launch the standalone client
- Join and finish a match through the server browser
- Try one scripted mode such as Gun Game or Flood Infection
- Complete a campaign co-op session with friends
- Open Forge and place your first AI encounter
- Host or moderate a community dedicated server
FAQ
Q: Is Project Reclaimer an official Halo product?
No. It is an independent fan project for Halo 3 PC players and is not affiliated with Microsoft, Xbox Game Studios, Halo Studios, or Bungie. It runs alongside your own Steam copy of Halo: The Master Chief Collection.
Q: Does the reverse engineered client modify my game files?
No. Project Reclaimer works with your existing MCC installation without replacing or rewriting original files. Keep Steam installed and signed in, but you launch the standalone client directly rather than entering the MCC menu.
Q: What makes it a reverse engineered AI game?
The project rebuilds access to Halo 3's campaign AI systems so enemies, vehicles, and squad behavior can be placed in multiplayer maps and Forge sessions, then controlled through Megalo and JSON scripting.
Q: How many players can join a session?
Multiplayer supports up to 128 players in a match, campaign co-op supports up to 16 players with mid-session joining, and dedicated servers offer up to 127 slots.
Q: Where do I download Project Reclaimer and find the community?
Download releases from the official GitHub releases page and visit projectreclaimer.dev for the How to Play, Forge, and hosting guides. The official Discord, linked from the site homepage, is the main channel for updates and support.