I Spy Board Game Ideal 1965.
In this game each player is a secret agent on a mission and the object is to beat your opponent in completing your mission before they complete theirs. If at any stage during the game you encounter an opponent you would need to make a challenge, using a special dueling mechanism supplied with the game (the best item in the box and more fun than the game). The loser of any duel would then have to re-start their mission from the beginning.
