Star Trek
Star Trek is a classic 1970s console game that originated on mainframes. The game is relatively simply by modern standards but still addictive. Many versions exist, most of them in BASIC, but there have also been ports to Common Lisp. The most famous variant of the game is David H. Ahl's Super Star Trek (1978), which became the basis for most later ports.

The objective is to destroy all Klingon warships on the map within a given time limit. The map is divided into 8x8 quadrants, which are in turn divided into 8x8 sectors. UFP star bases provide supplies of photon torpedoes and navigation is manual, i.e. one must take care not to plot a course into a star accidentally.

Sample gameplay (CLISP):

[1]> (load "trek.lsp")
;; Loading file trek.lsp ...
;; Loaded file trek.lsp     
T                           
[2]> (trek)                 
THE USS ENTERPRISE --- NCC-1701
                  ,------*------,
  ,-------------   '---  ------' 
   '-------- --'      / /        
       ,---' '-------/ /--,      
        '----------------'       
YOUR ORDERS ARE AS FOLLOWS:      
--------------------------       
   DESTROY THE 56 KLINGON WARSHIPS WHICH HAVE INVADED
   THE GALAXY BEFORE THEY CAN ATTACK FEDERATION HEADQUARTERS
   ON STARDATE 3857.00. THIS GIVES YOU 57 DAYS.             
 THERE IS 1 STARBASE IN THE GALAXY FOR RESUPPLYING YOUR SHIP.

ARE YOU READY TO ACCEPT COMMAND? ('N' FOR End)y
YOUR MISSION BEGINS WITH YOUR STARSHIP LOCATED 
IN THE GALACTIC QUADRANT, 'CANOPUS I'.         
  COMBAT AREA      CONDITION RED               
      SHIELDS DANGEROUSLY LOW                  
   +0-1-2-3-4-5-6-7-+                          
  0|. . . . . . . K |        STARDATE           3800.00
  1|. . . . . . * . |        CONDITION          *RED*  
  2|* . . . . . . . |        QUADRANT           4 0    
  3|. . . . . . . E |        SECTOR             3 7    
  4|. . . . . . . . |        PHOTON TORPEDOES   10     
  5|. . . . . . . . |        TOTAL ENERGY       3000.00
  6|. . . * * * . . |        SHIELDS             0.00  
  7|* . . . . . . . |        KLINGONS REMAINING 56     

COMMAND
com    
ENTER ONE OF THE FOLLOWING:
-------------------------- 
  W  (WARP)                
  S  (FOR SHORT RANGE SENSOR SCAN)
  L  (FOR LONG RANGE SENSOR SCAN) 
  P  (TO FIRE PHASERS)            
  T  (TO FIRE PHOTON TORPEDOES)   
  Z  (TO RAISE OR LOWER SHIELDS)  
  R  (FOR DAMAGE CONTROL REPORTS) 
  C  (TO CALL ON LIBRARY-COMPUTER)
  XXX  (TO RESIGN YOUR COMMAND)   
  (zzz  break for debug)          

COMMANDc
COMPUTER ACTIVE AND AWAITING COMMAND
a                                   
FUNCTIONS AVAILABLE FROM LIBRARY-COMPUTER:
----------------------------------------- 
   G = CUMULATIVE GALACTIC RECORD           
   S = STATUS REPORT                      
   T = PHOTON TORPEDO DATA                
   B = STARBASE NAV DATA                  
   N = DIRECTION/DISTANCE CALCULATOR      
   Z = GALAXY 'REGION NAME' MAP           

COMMANDc z
COMPUTER ACTIVE AND AWAITING COMMAND                        THE GALAXY
       0     1     2     3     4     5     6     7                    
    +-----+-----+-----+-----+-----+-----+-----+-----+                 
              ANTARES               SIRIUS                            
                RIGEL                DENEB                            
              PROCYON              CAPELLA                            
                 VEGA           BETELGEUSE                            
              CANOPUS            ALDEBARAN                            
               ALTAIR              REGULUS                            
          SAGITTARIUS             ARCTURUS                            
               POLLUX                SPICA                            
COMMANDL                                                              
LONG RANGE SCAN FOR QUADRANT 4,0                                      
 *** 005 108                                                          
 *** 106 102                                                          
 *** 204 101                                                          

COMMANDS
   +0-1-2-3-4-5-6-7-+
  0|. . . . . . . K |        STARDATE           3800.00
  1|. . . . . . * . |        CONDITION          *RED*  
  2|* . . . . . . . |        QUADRANT           4 0    
  3|. . . . . . . E |        SECTOR             3 7    
  4|. . . . . . . . |        PHOTON TORPEDOES   10     
  5|. . . . . . . . |        TOTAL ENERGY       3000.00
  6|. . . * * * . . |        SHIELDS             0.00  
  7|* . . . . . . . |        KLINGONS REMAINING 56     

COMMANDz
ENERGY AVAILABLE =3000.  NUMBER OF UNITS TO SHIELDS ?1000
DEFLECTOR CONTROL ROOM:  'SHIELDS NOW AT 1000 UNITS PER YOUR COMMAND.'

COMMANDw
COURSE (0-8, -1)0
WARP FACTOR (0-8).1
Klingon at 0,7 moves to 1,7
261 UNIT HIT ON ENTERPRISE FROM SECTOR 1,7 .
      <SHIELDS DOWN TO 739 UNITS>           
DAMAGE CONTROL: 'WARP ENGINES DAMAGED BY THE HIT'DAMAGE CONTROL REPORT:  WARP ENGINES REPAIR COMPLETED.
DAMAGE CONTROL REPORT:  SHIELD CONTROL DAMAGED                                                         
(2,7)                                                                                                  
   +0-1-2-3-4-5-6-7-+
  0|. . . . . . . . |        STARDATE           3800.00
  1|. . . . . . * K |        CONDITION          *RED*  
  2|* . . . . . . E |        QUADRANT           4 0    
  3|. . . . . . . . |        SECTOR             2 7    
  4|. . . . . . . . |        PHOTON TORPEDOES   10     
  5|. . . . . . . . |        TOTAL ENERGY       2728.00
  6|. . . * * * . . |        SHIELDS            739.00  
  7|* . . . . . . . |        KLINGONS REMAINING 56     
                                              
COMMANDT
PHOTON TORPEDO COURSE (0-8, -1)0
TORPEDO TRACK:                  
*** KLINGON DESTROYED ***

Game