EXO is a cancelled FPS that was in development by Particle Systems / Infogrames for the Playstation 2. It was going to be released in 2002, but during the development something went wrong and the project was canned. It’s possible that EXO was axed when Particle System was aquired by Argonaut and became Argonaut Sheffield. The studio was officially closed down in october 2004.
In the original press release we can read some features of the game:
Tactical combat throughout 18 diverse indoor and outdoor locations;
Intense combat against 14 distinct enemy types with multiple variations, each demonstrating advanced artificial intelligence and the ability to learn;
The story unfolds across the whole game with cinematic cut-scenes and through 12 intelligent, individual team members with their own hopes, fears, and motivations
Physics-based character animation and a new photometric graphic engine show unparalleled levels of realism of characters and their surroundings
You can find a nice gallery of artworks realized for this project at Gar HJ’s Website!