In this game, you are given a board with a number of dots on it, and you have to take turns to fill up the space by drawing lines between two dots. If you can complete the fourth side of a box, you can win the game. 

You can play with people around the world, and you can also play against bots to practice. The bots have a higher level of intelligence than you, so you can expect to win more often than not. The game is designed to be easy to play, so you don't need to be an expert to win.