And the fourth day of Steam’s Holiday Sales has just begun. Today, PC gamers can get Mass Effect 2, Blur, Torchlight, LIMBO and Silent Hill: Homecoming with a 75% discount. In addition, Operation Flashpoint: Red River comes with a 80% discount, whereas Warhammer 40K: Space Marine comes with a 50% discount. You can view the entire list after the jump. Enjoy!