Invasion

Invasion is one of the six add-on games for the Odyssey released in 1972.
It requires game cards #4, #5, and #6 originally supplied with the system.

The game is heavily based on the classic board game Risk. The fantasy world
is represented as a number of countries on the included game board, and
players try to conquer their opponents’ castles. The console is used to battle
out attack and defense.

A player can either choose to sneak into the castle by trying to blindly move
her player spot to the gates, or attack directly by maneuvering the game ball
around the defensive player. Once inside the castle, she has to try to destroy
the tower defense by estimating where the ball spot will land on the screen.