The surface has fallen. As the outer world dissolved into an uninhabitable ruin, humanity’s last survivors retreated into isolated underground bunkers. Yet the greatest threat isn't lurking outside—it is the relentless Corrosion consuming the shelter from within.

Under the Rust is a tactical UI-driven PvE bunker management simulation. Take control of the C.O.R.E. terminal, command your crew, and balance life support systems before structural decay buries you alive.

C.O.R.E. TERMINAL COMMAND & SYSTEM DECAY

• Retro-Terminal Interface: Oversee all critical facility operations through a tactical terminal interface. Diagnose system failures in real-time and execute vital directives.

• Fight the Rust: Structural corrosion is your main enemy. As rust spreads, power grids, water lines, and oxygen scrubbers fail—requiring continuous maintenance and repair.

• Life Support Balance: Maintain a delicate equilibrium between power distribution, water filtration, and oxygen supply. A single failure can trigger a catastrophic chain reaction.

TACTICAL CREW RPG & SURFACE EXPEDITIONS

• Deep Personnel Management: Assign operatives to key roles based on their stats (STR, PER, INT), skills (Engineering, Scavenging, Hacking), and unique personal traits.

• Surface Expeditions & Radar: Scan surface sectors for anomalies and structural ruins. Dispatch recon teams into dangerous territory to recover vital raw materials and tech components.

DIRECTIVES & EMERGENCY LOGS

• Policy Management: Enforce strict directives, workload quotas, and emergency protocols to maintain bunker stability.

• Real-time C.O.R.E. Logs: Every mechanical failure, crew conflict, or surface radio transmission is intercepted and displayed through system logs.

MODDING & SYSTEM ARCHITECTURE

• Modular JSON Architecture: Events, construction costs, production, and consumption values are structured around JSON files. The game continues to be actively developed upon this modular foundation.

• Multi-Language Support: The flexible language framework allows community translations and localization packs to be integrated seamlessly.

• Dynamic Crises & Replayability: Procedural surface anomalies, crisis events, and crew dynamics ensure that every new run presents a unique survival scenario.