Jetpac

1. Gameplay

In the game, Jetman must first assemble his rocket. Then, he must gather fuel. Various enemies will attempt to stop him as he does this.

2. Enemies

The enemies change every level (however, they eventually cycle) and each alien has a different pattern of movement which means they can be dealt with in a different manner. These two enemies, as Wikipedia calls them, are: "darts" and "flying saucers". The darts move horizontally, while flying saucers will bounce around the screen.