Blizzard is celebrating the fourth anniversary of Overwatch with a new anniversary event that will run through June 9. New cosmetics will of course be added, and three epic skins for Sigma, Widowmaker, and McCree can be unlocked by completing weekly challenges.

Nine wins in each week of the anniversary event will get you:

Week 1 Carbon Fiber Sigma epic skin

Week 2 Fleur de Lys Widowmaker epic skin

Week 3 Other, Reaper, Zenyatta, Ash, Wrecking Ball, and Mercy will receive five Legendary Skins, as well as new player icons, emotes, and sprays during the event. More information at playoverwatch.com.