The Undercity: Last Light

A home beneath a dying world. A future shaped by your decisions.

The Undercity: Last Light is a single-player colony simulation in 2D pixel art. Carve a settlement into the rock, keep its production lines running, and lead the people who depend on them. Expanding is only part of the challenge: your colony must be able to live with the choices that make it grow.

Carve out a colony that works

Excavate galleries, connect floors and build farms, kitchens, workshops and homes. Workers carry materials between rooms and storage. Plan your layout, assign specialists and choose whether to expand or invest in stronger upgrades. A new workshop is only useful if people and supplies can reach it.

Your people have limits

Long shifts can help you through a shortage, but exhaustion and injuries take workers away from production. Families need homes; the next generation needs training. Decide how much to invest in rest, care and education while keeping the colony supplied.

Choose what you can afford to sacrifice

Respond to requests, take on trade commitments and weigh immediate supplies against effects that last for colony days. Put scarce materials into research, repairs or expansion. Your decisions, workforce and room specializations shape how your colony develops along its story.

Keep the lights on when the ground shakes

Prepare for breakdowns and earthquakes. Fund maintenance, strengthen safety and care for the injured. When damage spreads through your colony, choose what to restore first—and what must wait.

Build toward a future beyond survival

Discover the Thermal Rift, Fungal Sea and Resonant Archive, each with its own machinery, hazards and story. Bring their systems online, undertake Grand Projects and choose a Civilization Project. Progress from a fragile refuge to a lasting settlement, then continue managing the colony you built.

What will your people endure to reach the light?