Blizzard is teasing what appears to be an entirely new game mode in their fantastic online card game, Hearthstone.
On Twitter, the studio released a GIF image of the game's main menu, showing one of its panels pulling back to reveal a new clickable button.
The animated GIF appears beneath the three existing buttons: Play, Solo Adventures, and The Arena. For now, it doesn't bear any kind of label, leading to a lot of speculation on the interwebz about what Blizzard has in store for gamers.
There's a hope among many that the studio will unveil a tournament mode. Other possibilities include a stat tracker or achievement list, which the game has yet to feature despite their inclusion in Blizzard's other titles.
Whatever the mystery, we'll keep you updated.