v1.0.0 — First stable release

OpenChaos v1.0.0 — First stable release

Unofficial modernization of Urban Chaos (1999). Requires original game files (Steam/GOG).

The first stable release. OpenChaos is the same Urban Chaos — not a remake — now fully playable start to finish on Windows, macOS (Apple Silicon) and Linux (Steam Deck), with reworked controls, gamepad support (Xbox and DualSense), any screen resolution, and a heavily modernized engine. No critical bugs; a few minor ones remain.

How OpenChaos differs from the original

Full lists of how OpenChaos differs from the retail Urban Chaos:

• Gameplay (controls, camera, combat, vehicles, cheats, mechanics) — GAMEPLAY_CHANGES.md
• Technical (OpenGL renderer, 64-bit, cross-platform, unlocked frame rate, new audio/video backends) — TECHNICAL_CHANGES.md

How to run

1. Download the zip for your platform
2. Extract into your Urban Chaos game folder (where the data folder is)
3. Run OpenChaos.exe (Windows), OpenChaos.command (macOS), or OpenChaos.sh (Linux)

Requirements

• Original Urban Chaos game files (Steam or GOG) — any language works
• Windows 10+ (x64), macOS 12+ (Apple Silicon), or Linux x86_64 (Steam Deck compatible)