Humble Mumble has details on the new Humble Weekly Sale, which offers a chance to pick up the entire Serious Sam series of not very serious first-person shooters. As usual, this allows customers to pick their own price while supporting charity with their purchases. This also includes the revelation of Serious Sam 4, saying that Croteam's proceeds from the proceedings will help fund the next installment in the franchise, which is expected in 2014, saying: "All funds to the developers in this weekly sale will go towards making the upcoming Serious Sam 4 the craziest and greatest Serious Sam game EVER."