Spacemaster X-7 for the Atari 2600 is a classic shoot 'em up video game developed by Sirius Software and published by 20th Century Fox in 1983. In this space-themed arcade-style shooter, players pilot a spacecraft, tasked with penetrating anti-matter barriers and enemy defenses to destroy an enemy base known as Ultra. Players must strategically manage their ship's shields and laser energy while facing waves of enemy drones and turrets. The game is noted for its challenging gameplay and was part of the wave of space shooters influenced by the success of titles like Space Invaders and Asteroids.