If you're a gamer, you likely know the mirthful duo that is Penny Arcade. Most of you even like them. Well, there's a good chance you'll like them just a little more now that they are giving away a Steam copy of their game The Rain-Slick Precipice of Darkness 3 for FREE. I'm proud to say I bought the game before it was free and even happier to say that I really enjoy it. At free, what do you have to lose?