To win: connect 4 pieces in a row, column or diagonally
(See more versions at Connect Games)

In this version, when the bottom row is full, the whole board drops down a row!
Four In A Line Rules

Point the cursor over the row you wish to drop your piece in.
Left click to drop your piece
When you can connect four pieces vertically, horizontally or diagonally you win

History
This game is centuries old, Captain James Cook used to play it with his fellow officers on his long voyages, and so it has also been called "Captain's Mistress". Milton Bradley (now owned by Hasbro) published a version of this game called "Connect Four" in 1974.

Other names for this this game are "Four-in-a-Row" and "Plot Four".