Serf City is one of the most fun (and addicting) strategy games I've ever played. It originates from a German board game with the name "Die Siedler" ("Settlers"). I've played that board game too. The only thing that I missed in Serf City is a "robber" and human interaction. The rest is all improvements.
Mission # Password 1
In this game you are a king over a population of serfs. Your task is to colonise the worlds of varying sizes, competing with other kingdoms. The resources are limited and must be managed wisely. You build houses, roads, keeps, and build up an army to guard your territories and to conquer new ones.
There are many startegies to complete your goals. Many of the are discribed in the FAQ, along with some general guidelines to the game - it's almost as good as a manual! The game can be played alone or (if you have 2 mice) with - or rather, against - your friend. You can play through a row of scenarios, or design you own. The table to the right contains passwords to the first 18 missions in this row of scenarios - just choose any...
Gaming hint, which is not in the FAQ: If you think some missions are too easy, try not using geologists. I managed to play missions 1 through 9 without using them. The key strategy in such a case is to see which resources are found by your opponent(s) and trying to build close to (or conquer) your opponents' findings. You can also try building clusters of four mines and see which of the four would give revenue.