Space Raiders

The player controls a small ship at the bottom of the screen, which moves horizontally and fires vertically upwards. Alien vessels move as a group horizontally across the screen until they reach the edge, move down 1 level, and reverse direction. As they move, aliens fire towards the player. Three barricades offer protection for the player. When all enemy vessels are destroyed, the player moves to a higher challenge, where the enemy vessels start 1 row lower. The player starts with 3 ships, and bonus ships are made available at point thresholds dependent upon skill level. There are 3 levels of difficulty.