Gomoku (called also Five in a Row or Gobang) is a well known board game. It is played with black and white stones on a 15x15 board.
Players put alternately a stone of their color on an empty square.
The player who gets 5 stones in his color horizontally, vertically, or diagonally (one next to another) is the winner.
In this application you could choose one of 3 computer opponents (varying in difficulty) or play multiplayer mode - so you could play with your friend!
Moreover, this app is equipped with 3 rankings of best players sorted by number of moves and then by time of the game (the less is the better) which allows you to compare your results.