Space Invaders

Space Invaders is a 1–2 player arcade game for the BBC Micro.

The player must defeat waves of space invaders. The player controls a base that moves laterally at the bottom of the screen and fires vertically. Enemy invaders move as a large group across the screen until they reach the edge, move down one row, and reverse direction. UFOs travel across the top of the screen for bonus points. Aliens fire towards the player and, if hit, the player loses a life. Four large bases offer protection from enemy fire. There are six levels of difficulty that control base size and enemy bomb speed.