From the Rules: Invasion is a game for two to four players, who have before them a board divided into 13 rows of 13 alternatively white and blue squares.

The board is marked to show the starting position of the various pieces within each player's territory. There are 15 total units in a player's force, 6 Soldiers, 2 Tanks, 2 Cannon, 2 Bombers, 2 Pursuit Planes, 1 Dictator. These units are all lead miniatures (flats). Each unit type has a different movement, for example the soldier can move 1 space in any direction, the tank can move 1 or 2 squares in any direction. A unit is captured by entering its square and in some cases (cannons) the unit capturing can jump over intervening friendly units.

The object of the game is to capture the opposing dictator or dictators at which time the captured dictator's entire army "surrenders" and is removed from the board. When four people are playing then two sides ally and both players on one side must be defeated.