Hearthstone Senior UI Designer Derek Sakamoto took to the GDC stage last week to talk about how Hearthstone developed over time. Since Hearthstone doesn’t have its own massive virtual world like Warcraft or Overwatch, UI is a key element and Sakamoto has a unique perspective on its development — and the physicality of the game, which makes it unlike some of the other digital card games on the market. Hearthstone fans, we recommend setting aside a half hour to watch the video below — if only to see Hearthstone‘s very different origins.