Connect Four is played like a vertical tic-tac-toe. The difference
with tic-tac-toe is that you must get four checkers in a row and
they are piled one on top of the other. One player has red checkers;
the other has yellow checkers. To play, alternate turns at dropping
one of the checkers down a slot at the top of the upright grid of
circles. The first player to get four checkers lined up in a row
in any direction: horizontal, vertical, or diagonal - is rhe winner
of the game..