The game is viewed from a first-person perspective. Players explore Egyptian ruins, temples, tombs, and outdoor areas while fighting alien soldiers, undead creatures, and other monsters. Weapons include conventional firearms and supernatural tools, and ammunition and health must be managed during each mission.

Levels contain switches, keys, hidden passages, items, and routes that may become accessible only after gaining new abilities. The campaign is structured around separate areas connected by objectives and exploration, with backtracking used to reach previously inaccessible locations. Platforming, swimming, combat, and environmental interaction all contribute to progression.

Search each area carefully for keys, switches, ammunition, health, and hidden passages. Some routes are deliberately inaccessible until a later ability is obtained, so remember locations that contain blocked doors or unreachable platforms.

Conserve powerful ammunition for durable enemies and use the environment to create distance when possible. Save health before entering unfamiliar rooms, and learn enemy attack patterns rather than relying on continuous close-range fire.