[Death by Mirrors]

A series of games, actually. The original Guild Wars consists of three different standalone campaigns and one expansion pack. Quite a strategic game, you reach maximum level fairly early and in each town or outpost you can switch the skills you're going to use for the next mission, so it's easy to experiment. Then there's Guild Wars 2, which feels more like a casual game and has the skills tied to your currently equipped weapon. GW2 plays like 200 years after the storyline of GW, but in all honesty I like both the story and the gameplay of the original better.