...first of all here is the link to their homepage http://spellforce.com/sf2/
The deal about the game is that you run around in different maps and have to solve main quests and minor quests. Some of them aren't very easy even when you play it in the easy mode like I do.
The cool thing is that those maps aren't like real levels. You can still go back and solve some older minor quests but you have to solve the main quests to get to the new maps.
The game came out in the beginning of 2006 and I got it for only 15 Euro. It is a German game I think.