An excellent game for free.
This game is a game in the style of Sierra's old 'Quest for Glory' series, only better. It is a mixture of RPG and adventure, where you choose one of three different classes, your standard fighter/mage/thief, each with different approaches to combat and the puzzles that you have to solve.
While there is combat, the major focus is on the story and the puzzles. These are fantastic. The setting is very much "Norse" and the designers clearly know their stuff. They have clearly studied the old myths very well and are familiar with not merely the major figures, such as Odin, Thor and Loki, but also with less-known ones, such as the giant Thiassi (who plays a role in the backstory). They have gotten the myths exactly "right" and the gods appear just as dramatic, ominous and sometimes morally dubious as they do in Norse legend. They do not follow the legends slavishly, however, but adapt them to their own universe and do so very well. Svartalfheim, for example, resembles some of the more interesting modern takes on dark elves, with eerie Escher-like geometry, while still mixing extremely well with the Norse feel.
The characters you meet and interact with are also interesting. Very human and sometimes tragic, again staying true to the Norse theme. The puzzles are mostly very good, though a few can be annoyingly tricky. Combat is simple, but enjoyable, and you feel your character's progression in power, and how it increases your options and ability to move around freely in a dangerous environment. If it is not to your tastes, you can decrease difficulty, so that it doesn't matter.
This game is easily worth money to play and you can get it for free. What are you waiting for?