A tractor

An old-fashioned, semi-serious, social-economic simulation and galactic world construction game combining trading, vehicles, mini-games and blowing things up, which also gives the dedicated few the opportunity to make their own games within the wider universe.

In the starting star systems you'll find a few different planets to explore. Some are long-term persistent worlds that evolve while you're not playing, others are little minigames or places to mess about in biplanes. What you need to do varies depending on what other players are doing and what has been built in the past.
Money and Kudos earnt playing on planets can be converted to galactic credits, which you can use to buy new ships and systems that help you explore the universe further.

If you're feeling creative the game includes a powerful 'World Editor' which you can use to make your own planet and games for other players to find and explore.