Dont remember the movie title, help by trailer description!?

Hey, i saw this movie trailer, but i dont remember how's the movie called! It showed like a "game" where people played some characters and it was all like in the viking time of something, and then everything got out of control and it stopped being a game! I remember one guy's named eric, and there was a girl who said that she would leave if it stopped being fun, and then they tried to rape her... That's all i remember from the trailer! Please, help! :)