Enigma II

Enigma II is a fixed screen space shoot-em-up with four waves of enemies. You control a ship that can move back and forwards across the bottom of the screen, and fire vertically. You also have a limited amount of fuel which will allow you to launch yourself up in the air to escape enemy attacks, or to refuel.

The first enemy wave is a set of Space Invaders inspired aliens which bounce around the screen, and plant bombs every time they reach the ground. The bombs explode after a short delay. The second wave features bird like aliens resembling those from Phoenix . When hit, these aliens release a bomb that falls to the ground and explodes on impact. It also turns into a smaller bird that fires darts at you. The third wave consists of flying saucers, which loop around before swooping along the planet's surface in an effort to collide with your ship. The final wave consists of a large UFO on the other side of a moving star-field. You need to hit the vulnerable centre section of this UFO four times, while avoiding its return fire.

After the four waves have been defeated, a refuel ship appears at the top of the screen. You must successfully traverse the star-field and dock with the ship before it leaves. Failure to do this means that your fuel will not be replenished for the next four enemy waves, which will be at a higher level of difficulty.