Shellshock 2 blasts players with a blood-and-guts, heat-and-humidity, altered-states interpretation of a soldier's experience in the Vietnam War. As much (if not more) than Eidos' original Shellshock, Blood Trails aims to present gruesome and disturbing aspects of war, with first-person shooter action in a tense, survival horror-style atmosphere. In a speculative-fiction step beyond the straightforward original, Shellshock 2 sets players against not only the evils of men in times of war, but also against a darkness that threatens the soul of all humanity.
A top secret cargo, known by the codename "Whiteknight," is lost when the plane that was carrying it disappears over uncharted jungles of Vietnam. Special Forces squads were sent to find and retrieve Whiteknight, but they too disappear -- except for one poor soldier, who makes his way out of the jungle a month later, dangerously insane. Now, Whiteknight promises its own special hell to the player brave enough to seek its secrets in the jungle. Visual effects, audio cues, and even the way the game plays all change as the experience progresses, to impart a sense of disorientation, deterioration, and dismay.