|A build screen. Click|
here for a larger image.
The aim is to build a fleet of ships and to control as many islands as possible. If you are lucky, you can find an unoccupied island to conquer. However, when I played it, it seemed that a few people owned huge empires and armies which made it very difficult for newer players to get very far ahead (unless you joined one of their empires.)
A battle calculation.Click here for a
The game boils down to making calculations for sailing times and for battles to see if you can win. There are other aspects such as mining and logging, trading resources and making alliances but eventually, you will probably get caught up in some war eventually.
In terms of inspiration for gamebooks, it is a good guide for simple battles and managing settlements. I have not played the game for some years so they may have sorted out the balance issues. It is important in a game to make sure that everyone can advance and that a few people don't control most of the resources as that leaves out most of the players and stops them having much fun.
You can play Inselkampf here.
You can read the wiki for instructions here.