Spacechase

You are on a moon-based scouting mission in a Mark 16 Starcruiser. Suddenly, enemy alien ships teleport in and start firing neutron missiles, which can destroy you upon impact. You must destroy enemy ships until reinforcements arrive from Earth. The enemy also have laser-directed heat-seeking proton missiles which are fired sparingly. Be aware that as the battle progresses, the aliens will become more desperate and will use the laser-directed heat-seeking proton missiles more often.

You can move in any of the eight directions in the bottom third of the screen. Press the button to fire.

Scoring

Minimum heat seeking missile variations:

Level one alien=125 points

Level two alien=200 points

Level three alien=275 points

Shooting an alien missile=50 points

Maximum heat-seeking missile variations:

Level one aliens=175 points

Level two aliens=250 points

Level three aliens=325 points

Shooting an alien missile=100 points

You reach level two at 10,000 points. You reach level three at 40,000 points. You can also start at these levels in certain game variations (see Game variations below)

Difficulty switches

A=Your shots are slower

B=Your shots are faster

Game variations

Games 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, and 23=One player

Games 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24=Two player

There are limited heat-seeking missiles on games 1, 2, 3, 4, 5, 6, 13, 14 ,15 ,16, 17, and 18

There are maximum heat seeking missiles on games 7, 8, 9, 10, 11, 12, 19, 20, 21, 22, 23, and 24

Enemies start at level one on games 1, 2, 7, 8, 13, 14, 19, and 20

Enemies start at level two on games 3, 4, 9, 10, 15, 16, 21, and 22

Enemies start at level three on games 5, 6, 11, 12, 17, 18, 23, and 24

Game is in daytime on game 1 through 12

Game is in nighttime on games 13 through 24.