Sigma goes live on Overwatch test servers today — here’s the new tank’s kit – Polygon sleon 5 years ago Sigma is a tank who can turn the tide of battle Read More » SOURCE: Polygon This site is not involved in the creation of this post. Related posts: PSN name changes go live today – Polygon PSN name changes go live today – Polygon Xbox Live heading to iOS, Android, and Switch – Polygon The Game Awards 2018 live stream, date and start time – Polygon