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The Undercity: Last Light
Build an underground city in this 2D colony sim. Dig, connect production chains and manage workers whose needs can’t wait. Face earthquakes, make difficult choices and explore forgotten regions as you lead a refuge toward a future beyond survival.

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Features
Single-player
Steam Achievements
Family Sharing
Steam is learning about this game 
Languages:
Interface Full Audio Subtitles
English ✔ ✔
Turkish ✔ ✔

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“The Undercity is about managing people as well as resources. Its production chains, social pressures, regional machinery and difficult decisions need feedback from different play styles. Early Access will help us refine the balance, make consequences easier to understand and improve performance as colonies grow.”

Approximately how long will this game be in Early Access?

“We expect approximately 6–12 months of Early Access after launch. This estimate may change based on player feedback and development progress.”

How is the full version planned to differ from the Early Access version?

“We plan to focus on stronger colony management decisions, more varied events, clearer interfaces and better performance and stability. We would also like to deepen longer-term progression beyond the existing civilization milestones. The scope and priorities may change based on testing and player feedback.”

What is the current state of the Early Access version?

“The current build lets you grow a refuge into an underground settlement through excavation, construction, upgrades, production, research and workforce management. It includes families, education, social demands, injuries and aging, breakdowns and earthquakes. You can follow the story through cinematics, explore the Thermal Rift, Fungal Sea and Resonant Archive, complete Grand Projects, run surface expeditions and pursue a Civilization Project. The current campaign has a finale, followed by continued colony management. English and Turkish interface text and subtitles are available. Balance, usability and performance are still being refined, and bugs may occur. Progression beyond the current campaign remains limited.”

Will the game be priced differently during and after Early Access?

“We plan to gradually raise the price as content and features are added during Early Access and for the full release.”

How are you planning on involving the Community in your development process?

“We plan to use Steam Discussions for bug reports, suggestions and feedback on balance, clarity and colony performance. Reports about difficult-to-understand decisions and growing colonies will help us set priorities. We also plan to share development updates and patch notes on Steam.”
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This game is not yet available on Steam

Planned Release Date: Oct 30, 2026

This game plans to unlock in approximately 13 days

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About This Game

Build below. Survive together.

The Undercity: Last Light is a single-player colony management game in 2D pixel art. Light a beacon to bring survivors home, carve rooms into the rock and turn a fragile refuge into an underground city. Follow the signals deeper into the earth while keeping the people who depend on you alive.

Build a colony that keeps moving

Dig galleries, connect floors and build farms, kitchens, workshops and homes. Workers carry materials through your colony: a productive room needs supplies, people and a route between them. Balance production chains, assign specialists across shifts, and choose between expanding your layout and investing in powerful upgrades.

Lead people, not just production lines

Your colonists work, rest, form families and grow older. Train new specialists, care for the injured and make room for the next generation. A longer shift may solve today's shortage, but tired workers need time to recover. More hands are useful only if you can feed and house them.

Make the hard call—and live with it

Respond to requests and situations arising in your colony. Rest an exhausted crew or keep a vital mine running? Spend scarce resources on repairs or push toward the next discovery? Compare the trade-offs, make your choice and see its consequences unfold over colony days. Your priorities shape the settlement you build.

Hold together when the ground shakes

Prepare for breakdowns and earthquakes with maintenance and safety improvements. When disaster strikes, tend to casualties and decide which rooms to restore first. Recovery competes with the same resources and workforce you need to keep growing.

Discover a future beyond survival

Explore the Thermal Rift, Fungal Sea and Resonant Archive, each with its own machinery, hazards and story. Restore forgotten systems, uncover cinematic story moments, complete Grand Projects and send teams on surface expeditions. Choose a Civilization Project and reach the current campaign finale, then continue managing the colony you made your own.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

AI tools assisted with portions of the artwork, animations, cinematic illustrations, text, and localization. No AI content is generated during gameplay.

Mature Content Description

The developers describe the content like this:

The game includes survival themes such as shortages, illness, injury, disasters and death. Colony residents may die due to accidents, earthquakes, unmet needs or old age. These events are conveyed through stylized pixel graphics and text notifications, without graphic gore or sexual content.

System Requirements

Windows
macOS
    Minimum:
    • OS: Windows 10 / Windows 11 (64-bit)
    • Processor: Intel Core i3-6100 / AMD Ryzen 3 1200 or equivalent
    • Memory: 8 GB RAM
    • Graphics: Intel UHD Graphics 620 / NVIDIA GeForce GTX 750 Ti / AMD Radeon RX 550 or equivalent
    • DirectX: Version 11
    • Storage: 2 GB available space
    • Additional Notes: Estimated Early Access requirements; minimum hardware has not been benchmarked. Lower resolution recommended for integrated graphics. Keyboard and mouse required. Large colonies and higher simulation speeds are more CPU-intensive.
    Recommended:
    • OS: Windows 10 / Windows 11 (64-bit)
    • Processor: Intel Core i5-8400 / AMD Ryzen 5 2600 or equivalent
    • Memory: 16 GB RAM
    • Graphics: NVIDIA GeForce GTX 1050 / AMD Radeon RX 560 or equivalent
    • DirectX: Version 11
    • Storage: 2 GB available space
    • Additional Notes: Estimated recommendation for larger colonies. SSD recommended. Keyboard and mouse required.
    Minimum:
    • OS: macOS 12 Monterey or later
    • Processor: Apple M1 or Intel Core i5 (dual-core, 64-bit)
    • Memory: 8 GB RAM
    • Graphics: Apple M1 integrated GPU or Metal-compatible Intel/AMD graphics
    • Storage: 2 GB available space
    • Additional Notes: Estimated Early Access requirements; minimum hardware has not been benchmarked. Native Apple Silicon and Intel support. Keyboard and mouse required.
    Recommended:
    • OS: macOS 12 Monterey or later
    • Processor: Apple M1 or better
    • Memory: 16 GB RAM
    • Graphics: Apple M1 integrated GPU or better
    • Storage: 2 GB available space
    • Additional Notes: Estimated recommendation for larger colonies. SSD recommended. Keyboard and mouse required.
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