A city curves into the sky
Take over an inhabited O’Neill cylinder, where rivers run beneath you and another neighbourhood shines overhead. The complete city is your starting scenery. Begin managing seven habitat modules and build the next chapter of life inside the cylinder.
Small decisions, a growing home
Build and upgrade housing, solar arrays, hydroponic farms, water recyclers, workshops and eco gardens across 48 managed plots. Keep an eye on food, water and electricity, balance credits and materials, and improve happiness and ecology. Daily forecasts and population charts make the economy easy to follow.
See prosperity in the skyline
Population milestones unlock five permanent stages of new scenery. More shop signs, stepped towers, elevated bridges, observation towers and glowing streets gradually enrich the existing city. Reaching 4,000 residents unlocks the final stage. Your unlocked scenery remains when the population changes.
Run the habitat at your pace
Choose from three starting scenarios, research three improvements and respond to eight kinds of two-choice events, including arrivals, storms, harvests and orbital trade. Pause at any time or run at 1×, 3× or 8× speed. Complete the habitat charter at 2,500 residents with healthy ecology, happiness and positive daily income, then continue building freely.
Explore your cylinder
Eight viewpoints, a surface map and free flight bring you from the curved skyline to riverside streets, gardens, waterfalls, logistics docks and the rotating axis city. Choose six lighting treatments or a cycling light schedule, adjust render quality, and export screenshots.
Included in version 1.0
Chinese and English interfaces, local autosaves, JSON save import/export and offline single-player play. The economy uses simplified habitat indices; the inherited background city and its preset transit form the setting, while managed modules drive the population and resource simulation.
