Game: Knights & Dragons: Rise of the Dark Prince

Most free-to-play games adhere to a fairly strict set of rules, and doing so tends to make them far less interesting than they could be. However, as with most other games of any genre, taking a familiar theme or idea and doing something even slightly out of the ordinary with it can make a huge difference. It's probably the reason I've been enjoying Knights & Dragons: Rise of the Dark Prince so much.