* Develop - Decide which megastructure designs your architects should pursue. There are 10 unique megastructures that can be researched.

* Build - Upgrade your megastructures multiple times, with each new stage offering unique benefits but requiring a larger city population.

* Optimize - Integrate your megastructure into the city and make it synergize with previously constructed buildings.

* Events - Make technical innovations to enhance your construction capabilities with 3 new events.

* Leaders - Reshape your Martian society into a construction-centered one with 3 new leaders.

* Projects - Focus on architectural innovation and resource efficiency with 5 new city buildings and 1 new technology.

* Scenario - Take on the challenge of a new longer scenario.

* Music - Accomplish all of this while listening to a new music track.

More details on the official game page of Terraformers: Megastructures ...