The purpose of Connect 4 is to align four pieces of his color horizontally, vertically or diagonally before the opponent. You play with the red checkers against the computer that has the yellow pieces. The first to align four pieces won.
Use your mouse to select the column where to place your token and click to drop.
(Automatic translation)
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.