Updated at 2:45 p.m.: Arena is back up and running.
Hearthstone is having a problem today.
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https://twitter.com/PlayHearthstone/status/582976158460968960
We’ve asked the publisher for a comment further explaining the situation.
Earlier today, Blizzard released the latest patch for Hearthstone. This update included some fixes, and it also prepares the game for the Blackrock Mountain content.
This outage is only affecting the Arena, which is the mode that enables players to piece together a temporary deck in an attempt to take on up to 12 different human opponents before losing three times. The longer you go, the bigger the reward you get. It is an especially popular style of play for people who stream the game on video sites like Twitch.
Solo play and online ranked and casual games are all still working.