This game is brutal and hard to start off and does not hold your hand. You can play it as a hack and slash but you will die quickly, often. Think of Oblivion's addictiveness with a far superior combat and levelling system. You are not restricted to a class' tendency throughout as you can decide to put points into whichever stat you like.
5 truly atmospheric worlds are split into sections like 1-1, 1-2, 2-1 etc. However, how you play and die affects the world and your character's tendency (black to white), and also how difficult your enemies are.
Lots to collect, upgrade, secrets, awesome bosses and a ground-breaking multiplayer.
Play online as a single player and you see apparitions of other players playing at the same time in their world. Players can leave messages on the floor, aiding others or you can click bloodstains to see the last few secs of another player's life.
Alternatively, you can use different stones to enter other players' world to assist them, or invade them.
This game is probably the best action (emphasis on action) rpg on any system, and dare I say, the best ever written.