Go (囲碁 / いご), weiqi (围棋), paduk (바둑) is a classical board game, popular in east Asia and increasingly elsewhere.

There are a number of ways to play free online, but most need registration. I made a little board so you can play without an account.

You can try the demo. The board works well, and you can play with a friend locally or online.

You can also watch a screensaver of go games taken from OGS (about 200 hours in a loop).

Credits:

• "newspaper" style board original
• Clack sounds stolen without permission from online-go.com. They are just recorded clack sounds of real stones.