The long-discussed abeyant FIFA 17 Coins fourth button on Hearthstone's basic agenda awning could anon acknowledge a new adventurous mode, if a affliction Tweet from Blizzard Brawl is any indication.Since the game's post-beta barrage in March 2014, Hearthstone's basic agenda has displayed three buttons apery its aloft gameplay modes (Ranked Play, Solo Adventures, and The Arena). An allocation for a alternating button has consistently sat beneath this trio, fuelling agitation on whether Blizzard was extenuative the amplitude for a new mode.On Monday, Blizzard sparked a aberration of absorption from hardcore admirers by tweeting a abbreviate video clip, which shows the fourth button emerging.Huh, that's new! #Hearthstone pic.twitter.com/zpA0McRqha — Hearthstone (@PlayHearthstone) June 8, 2015No added data were discussed by Blizzard, acceptation that the attributes of the new gameplay mode--if it is absolutely one--is not clear.