Meteorv2.prg

* Game Notes *

During a routine cruise through the Sirius system, the sirens of the Starship Pluto sound "Red Alert". The scanners have picked up an unusual storm of metallic meteors. The shipboard computers are not progranned to deal with anything like this. You will have to fire the photon blasters manually.

You have one blaster for each of the numbered sectors shown on the screen. Use keys 1 to 8 to fire. The sooner you hit the meteors, the more points you score.

The ship has a force field which will vaporise any meteors you miss, but will reduce in strength each time. The numbers near the centre of the display show the strength of this field. If meteor hits reduce the strength to zero in any sector the ship is destroyed.

At the start of the game you choose a level of difficulty from 1 (easy) to 20 (impossible). To win you must survive 30 meteors.

*Program Notes*

Lines 100-130: Define two graphics characters and set up display colours.
Lines 140-160: Input the level of difficulty and set the starting value of the variables.
Lines 170-200: Divide the screen into sectors.
Lines 210-240: Print the "Force Field"
Lines 250-330: Complete the scanner display
Lines 400-440: Select at random one of 16 starting positions for the next meteor.
Lines 450-490: Move the meteor towards the ship. The motion stops at line 470 if the correct key is pressed or at line 480 when the meteor reaches the force field.
Lines 500-520: Display a "hit"
Lines 530-540: Reduce the strength of the force field and jump to line 570 if the new value is zero.
Lines 550-580: Send the program back to line 400 for a new meteor or print the final score.