Learn the rules of the ancient board game Go (囲碁) - also known as Baduk (바둑) or Weiqi (圍棋) - with a fun, interactive tutorial. Sharpen your Go skills with daily random Go problems (Tsumego) at your choice of difficulty. Play Go against a variety of AI opponents, each with its own unique playing style and strength. Enjoy correspondence games with your friends, and challenge other players around the world!