Shellshock is a 3D action game where you play as a rookie in the anti-terrorist tank force Da Wardenz. The story follows your character's journey through 25 increasingly difficult missions, where you must prove yourself to be a valuable member of the team.
The game takes place at 'The Pen', Da Wardenz' headquarters, which serves as a hub for exploring and interacting with team members. Before each mission, you can explore the various locations, including the main hangar, basketball court, and simulation room, to learn more about the situation and your role.
The gameplay is from a first-person perspective, where you control the M-13 Predator tank, which is highly customizable and upgradable. The game has an arcade feel, similar to 'Quarantine' and 'Doom', with an emphasis on destruction and action. You can destroy enemies, but also trees and buildings.
After completing each mission, you earn cash that can be spent on repairing your tank and upgrading its capabilities.