Obsidian Conflict is a cooperative modification created for Half-Life 2. It is a community based mod with focus on fun, cooperative, and physics-related puzzles. The mod has an open story, but is still set in the Half-Life 2 universe.

- Coop Half-Life 2 Support.
- Customizable Hud and Flashlight
- New NPCs
- Scoring System
- New Weapons
- Cloaking Module
- Player Armor
- New Maps
- Advanced Customizability for Mappers.
- Custom per map Sound Scripts, Configuration Files and Soundscapes.
- Out of Hammer map modification via scripts.
- Gamemodes Including Iron Helix, Team Coop, Coop Lives and Fort.