Arkhan interacts and fights with many characters in Sparta. He has a girl friend, a best friend and several acquaintances. His father is a key figure in the game. Dark Earth feels more like an action game in that respect. The background sound effects of Dark Earth are excellent and very immersing.
Music plays occasionally at fitting times, far from intrusive.
The actors voices are fine. The acting perhaps has to be a bit ham for this type of game. It does seem in keeping. Puzzles Dark Earth is not a linear game. The city in which the game is contained is fairly extensive and there are many characters to talk to.