How about a space theme? Expand your empire by colonising new planets. The price to “buy” a new asteroid/moon/planet/solar system could depend on its size, resources (or maybe better if these are only known in a general sense - e.g. based on attributes that would be observable from the explored universe - until someone has explored it for the first time) and distance to your existing colonies. Could encounter alien races to discover new tech, attack other people’s colonies to pillage resources, etc. I’d play.
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Now that I think more about this, I reckon it is a real goer. Even a hot potatoes space assets game could work, but I think extending on the countries/etc. games and incorporating battle (with other players, with randomly appearing aliens) would be awesome. And space is cool - it looks cool (lots of scope for captivating graphics), and I think it captures the imagination for a lot of people. Do it! 😂😂
This also sounds really cool. Like yeah i know you can buy stars names in real life so why not.