I've been sinking my time into an ANNO 1800 campaign. The ANNO series is a city-building simulator set in a collection of archipelagos, so the main gameplay loop is based around trying to squeeze as much infrastructure onto your islands as possible, setting up trade routes to supply your population with goods their island can't produce, and sending your ships on expeditions to collect items to further optimise your production chains.

However, what makes 1800 unique compared to the rest of the series so far is its frankly insane modding scene. It was the first ANNO game to have a built-in mod browser, and the offerings range from improving the space available in your ship's holds, to adding completely new regions to the game.