Gomoku

Connect exactly 5 of the same stones in a row (horizontally, vertically or diagonally).

Set your marker on any unoccupied point of the board. Aim to make a line of five markers in a line, either horizontally, vertically, or diagonally. Prevent your competitor from forming their own row of five. Alternate setting stones with your competitor until one player succeeds in creating a row of five. Note that the game ends immediately when a row of 5 is created, with no need to occupy the entire board.