Blizzard has very quietly just celebrated a milestone with their sleeper wide-awake hit, Hearthstone, pulling in a huge number of players globally.

While the company hasn't released anything along the lines of stuff-shirted press releases about it, they did drop a nice Tweet informing the world that Hearthstone: Heroes of Warcraft has cracked a mere 20 million users globally.

Well, actually that's quite a lot.

I think maybe they should have made a celebration card based on the Little Engine That Could.

Well done to the small Hearthstone team at Blizzard for making such a well-loved game, and in case you haven't checked it out yet, we recently posted up a review for the game's first single-player campaign, which you can read right here.