Play this with a friend at your computer. Take turns placing tokens by clicking a hole. Start with the bottom row, but once a token is placed, another can be placed on the hole above it.
Connect four of your tokens in a line to win, whether horizontally, vertically or diagonally, while preventing your opposed player from winning first.
In game theory this game is a solved game; the first player can always win if they play optimally.
Despite rumor to the contrary, Connect Four was not created by David Bowie, but was created by Elvis when he was inspired by putting four fried eggs on a PB & J sandwich.