The underground mining city of Bravst has thrived under The Order's authoritarian rule, powered by oil extracted from deep-growing mushrooms. Engineer Dietrich is stranded alone in an abandoned district after an accident cuts him off from the rest of the city. Radio contact is intermittent. The ruins around him hold clues about why this area was sealed off — and the rulers of Bravst would prefer those secrets stay buried. Armed with makeshift light-based tools and projectile weapons, Dietrich fights through swarms of cave creatures to escape before The Order shuts him in permanently. A third-person shooter with a Horde mode for additional challenge.