Fourth Dimension

Fourth Dimension is a 1-player arcade game for the Apple II.

The player controls a small vessel that can move in all directions on the screen, but can only fire vertically downwards. The player combats a number of strangely designed alien vessels which move rapidly about the screen following specific patterns. The alien vessels can quickly scroll off one side of the screen and appear upon the other. The player must attempt to destroy all ships on the screen without being themselves being shot. If all enemy vessels are destroyed, the player advances to the next similar level. The player has a total of 3 ships, and when all are destroyed, it's game over.