Under Supernova

Under Supernova is a sandbox set in the distant future, where you can build and explore across seamless planets, manage settlements and their inhabitants, and travel to other planets and galaxies. You can control individual characters, multiple teams or spacecraft, and use tools for planning and automating work. The game also supports connecting large language models (LLMs) through capability interfaces that let them query information and control characters, terrain, items and buildings. The game does not provide an LLM; you can configure one to connect through local port 8223 after enabling the World Protocol.

Explore and build

Each planet is a seamless sandbox measuring 90 billion billion grids in length, width and height. You can excavate, build and interact across maps that are not limited to an n-by-n grid, and simulate activities such as farming and exploration in a map with a Z-axis. Terrain includes mountains, plains, hills, bodies of water at different heights, abandoned cities, deserts, swamps, snowcapped mountains, oceans, salt lakes and karst landforms. Temperature changes with altitude.

You can build a spaceship to explore other planets and galaxies. Terrestrial planets, gas planets and stars each present different challenges; surviving on a planet that has not been made habitable requires a considerable level of science and technology.

Direct and plan activities

You can control individual characters to role-play, collect, log, excavate, build, manufacture, fish, trade, form relationships and explore. You can also control an unlimited number of teams at once to fight, explore ruins and run businesses, or issue map commands to plan bulk collection, logging, excavation, construction, production and trade. Tools let you classify and manage character behavior and quickly locate people and piles of items.

For base management, simple automation uses signals and timers to move items and produce goods. You can define signal associations, switch item icons, detect temperature, pressure and water levels, and detect people passing by.

Settlements and inhabitants

NPCs follow rules of residence and have their own life paths, families, homes and property. They can be born, learn at school, marry and start careers; they also eat, drink and sleep independently, and can recommend teachers, guards and managers. Residential production chains use raw materials to make local specialties and essential goods.

You can recruit NPCs as members of your group or hire them to work for you, while player characters can seek work in neutral settlements. Individuals can earn foreign currency through economic activity within a group and use it to buy goods from other groups, rather than relying only on barter. You can also place production orders with neutral villages, whose residents arrange production themselves. Under ordinary conditions, the game can run hundreds of NPCs and thousands of units, including animals.

Characters communicate through spoken words whose frequency and volume diminish with distance. They can give commands, discuss needs, and receive and deliver tasks.

Life and survival

Plants accumulate biomass through photosynthesis as they germinate, grow, fruit and spread, passing it along a biological chain of plants, herbivores and carnivores. Plants compete for limited nutrients, and animals need real food to survive. Animals roam, feed, hunt, build nests, weave nets and reproduce.

Knowledge is required for skills and production. Each person holds knowledge separately and must learn it through guidance and knowledge carriers; existing knowledge can also lead to new discoveries. Knowledge can be engraved on stone, written on paper or printed on metal plates. It enables skills and combat methods, which can be improved, and skill levels can significantly increase attack damage. Characters can become stronger fighters through training and combat. Attack damage and equipment protection vary by physical properties: clothing made from fire-resistant materials can offer considerable protection from burns but may not protect against stabbing.

Diet, aging, injuries and contact with wild animals can cause diseases that range from mild to severe and may lead to complications. Medication can lessen or remove diseases, but may also cause adverse reactions or further complications. Untreated infections can kill characters, even after an ordinary battle, and small wild animals can carry deadly pathogens.

Multiplayer and openings

The game has initial support for local area network play. You and your friends can lead separate groups in the same continuous world, build urban areas, trade and cooperate to address crises.

You can define scenes anywhere on a planet, set events and tasks for particular scenes and times, link events with characters, and customize the starting supplies and characters to create your own opening. The game also includes multiple preset openings for different adventures.

Customize the world

The game’s free module system lets you define and expand items, creatures, buildings, production systems, knowledge, skills, combat methods, illnesses, injuries, career experience, tasks, events, preset characters, relics and large buildings, as well as the connections between them. Modules can be interdependent without requiring a particular order. A visual blueprint editor supports real-time editing of relics and large buildings, and the game’s data files can be modified and expanded. The system is not yet extensively filled with content, but includes several examples.