Today, Saber Interactive launched their Six Skulls Update for World War Z. Adding a new extreme difficulty to the game and exclusive rewards for those who complete it. Players who complete a single mission on extreme will earn a Wakizashi sword and completing all the missions on extreme will get you a unique sniper rifle skin. Lastly, Saber Interactive announced new paid skins coming this July and the Big Update. The Big Update will add new weapon variants, character skins, and accessories unlockable through gameplay. Also being added through the Big Update is weekly challenges and daily modifiers. World War Z is now available for PS4, PC, and Xbox One. Check out our review here.