Une info qu´on trouve sur le site officiel du jeu, section Game Info, rubrique Multiplayer:
"Be creative with the Mission Modifier by assembling a mission from editable terrain, weather settings, and customizable weapons locations and spawn points.
Upload and share with the Syphon Filter community your custom created mission.
Enhance your custom mission with variety of unlockable characters, such as a Pirate or an Alien, with the 10 level ranking system."
... La durée vie risque de s´allonger exponentiellement...
Source: http://us.playstation.com/LogansShadow