Enthusiasts have almost completely decompiled Halo: Combat Evolved and ported the game to PC and Android
Enthusiasts Nearly Fully Decompile Halo: Combat Evolved and Port the Game to PC and Android
A group of hobbyist developers has achieved more than 99 percent decompilation of the original Xbox release of the shooter Halo: Combat Evolved, and used that result to produce native builds for modern Windows and Linux systems, a full Android port, and an experimental browser edition that runs without emulation. The effort is available as the open project halo-ce-universal after reverse engineering an early European build of the game, version 2342.
Porting the game to mobile hardware required overcoming the console’s 32-bit data layout, which conflicts with contemporary 64-bit ARM processors. The team implemented a hybrid ILP32 AArch64 compilation strategy so the binary executes native 64-bit ARM instructions while retaining 32-bit pointers. The Android build uses OpenGL ES 3.0 for rendering and includes modern controller support, including Sony’s DualSense.
Beyond new platforms, developers lifted several legacy engine restrictions. The original Xbox System Link mode was limited to 16 players; the decompiled network stack has been extended to allow up to 128 players and 128 independent devices in a single session on large maps such as Blood Gulch.
I have to rewrite the network code and redo the interface, after which we will get cross-platform multiplayer for 128 players.
- Jonas Volman, lead developer of the halo-ce-universal project
The native ports also remove the fixed 30 frames-per-second cap. A revised interpolation system decouples rendering from the original fixed-rate physics while syncing visuals to display refresh rates of 60, 120, 240 Hz and beyond. A reworked graphics pipeline with multithreaded OpenGL support combined with Mesa drivers enables modern CPUs to push frame rates past 500 fps in some scenarios. Ultrawide displays are handled correctly: the horizontal field of view expands dynamically without stretching the user interface.
Work on the project had plateaued at roughly 1 percent completeness for years, but contributors say a breakthrough came in the summer of 2026 after integrating artificial intelligence tools. According to the team, large language models from the Claude family greatly accelerated disassembled-code analysis and the automated generation of C functions that match the original binaries byte-for-byte, cutting what would have been years of manual effort down to months.
The authors are presently trialing a browser build called Apollo and providing a launcher that can compile working game binaries directly from legally obtained xiso disk images. Planned next steps include adding full compatibility with fan maps from Halo: Custom Edition, adapting mods from Halo: The Master Chief Collection, and attempting decompilation of later entries in the series.