The full first chapter of the single-player story is entirely free.
You can access the ranked ladder for free after earning "10 First Wins of the Day" in Unranked or Versus AI matches. skachat kliuch k starcraft 2
While the base game is free, certain single-player expansions and cosmetic items still require a purchase through the official Battle.net Shop : StarCraft II The full first chapter of the single-player story
Since 2017, Blizzard Entertainment has made a significant portion of the game accessible without any purchase or product key: skachat kliuch k starcraft 2