The rule is very simple, to win you have to get five in a row.
Five in row is often played with a paper and pencil, in this app you can play vs your phone or in multiplayer mode
The winner is the first player to get an unbroken row of five signs horizontally, vertically, or diagonally, pieces are not moved or removed from the board
Five in row is a very famous game thanks to it's simplicity, it's known in several countries under different names,it's a very popular game in Japan China and Korea .