Six great games on one cassette. Listings of the programs and instructions on how to upgrade and modify them are included in documentation. Twirly Invader: Shoot the man fom Mars. Winding Stairway: Navigate through the winding stairway. Astro Dodger: Avoid flying space debris. Cross The Road: Avoid being hit by passing automobiles. Plus Alien Invaders and Defend. 1K.