Try to get a connecting line of 5 pieces. Scroll the board using the arrow keys to get a better view. Left click to play a red piece
Note: the board wraps around, so pieces on the far right of the screen affect those on the far left, and similarly with the top and bottom of the screen.
Return starts a new game.
Backspace returns to the main menu
To illustrate what is meant by wrapping, have a look at the following pictures, each of which is a winning position.