Mission 660 is an arcade game of which specific details remain limited without further information. The '(version)' designation suggests this title might be a variant or revision of an original game.  The gameplay and development history remain unknown without access to additional resources. Further research into arcade game databases or historical gaming records might uncover its origins, features, and developer.  Knowing the version number or additional descriptors would aid in identifying the game's creator and distributor.

Mission 660 (version)

Missile Command (rev 3)