THE THIRD DIMENSION                    

                         Pick the correct switch
                         -----------------------
Switch Puzzle by John Clarke.

This puzzle is from a game that I am currently writing called "The Escape".  
In this puzzle there are 6 switches on the wall and two force fields at each 
end of the corridor.  You have to select one of the switches in order to 
deactivate one of the force fields enabling you to go on further.  If you 
select the wrong switch a laser cannon will appear in the centre of the 
room and will start shooting at you.

Map
===

               -------------------------------------------
               :   |  1     2     3    4    5    6   |   :
               :   |               LC                |   :
               :   |                                 |   :
               -------------------------------------------

Key
---

1-6 : Switches
 |  : Force Field
LC  : Laser Cannon
                                     
Sounds simple doesn't it.  Well just to make it trickier I have written 
the code in such a way that the computer will decide which switch will 
deactivate the force field when you start the game.

Once the corridor was created I created an initial condition.  The initial 
condition makes both force fields fadebounce,  sets all variable used for 
this puzzle to 0 and then selects which switch will deactivate the force 
field.  The laser cannon is made invisible and is only made visible when 
the wrong switch is selected.

Variables Used
--------------

V30       : To store random number (0,1,2,3,4 or 5).
V31 - V36 : To identify which of the switches will deactivate the force 
            field.

When the computer has selected which switch will deactivate the force field 
it sets the appropriate variable to 1.

Switch Number  | Value of Variable V30 | Variable to set to 1
---------------+-----------------------+---------------------
      1        |          0            |         V31
      2        |          1            |         V32
      3        |          2            |         V33
      4        |          3            |         V34
      5        |          4            |         V35
      6        |          5            |         V36

When the game starts and you shoot at a switch the computer looks at the 
value of the variable for that switch and if it equals 1 the force field is 
deactivated.  Otherwise object 15 (The Laser Cannon) is made visible and it 
starts shooting at you.

This is the only area of the game that I have sent in for the 
diskmag so you will not be able to go any further.

       John Clarke

The Code for this Puzzle
========================

Initial Condition 
-----------------

FADEBOUNCE (6)
FADEBOUNCE (7)
INVIS (15)
SETVAR (0,V30)
SETVAR (0,V31)
SETVAR (0,V32)
SETVAR (0,V33)
SETVAR (0,V34)
SETVAR (0,V35)
SETVAR (0,V36)
RANDOM (5,V30)
IF VAREQ? (V30,0)
THEN
 SETVAR (1,V31)
ENDIF
IF VAREQ? (V30,1)
THEN
 SETVAR (1,V32)
ENDIF
IF VAREQ? (V30,2)
THEN
 SETVAR (1,V33)
ENDIF
IF VAREQ? (V30,3)
THEN
 SETVAR (1,V34)
ENDIF
IF VAREQ? (V30,4)
THEN
 SETVAR (1,V35)
ENDIF
IF VAREQ? (V30,5)
THEN
 SETVAR (1,V36)
ENDIF

Switch 1
--------

IF SHOT?
AND VAREQ? (1,V31)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF

Switch 2
--------

IF SHOT?
AND VAREQ? (1,V32)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF

Switch 3
--------

IF SHOT?
AND VAREQ? (1,V33)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF

Switch 4
--------

IF SHOT?
AND VAREQ? (1,V34)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF

Switch 5
--------

IF SHOT?
AND VAREQ? (1,V35)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF

Switch 6
--------

IF SHOT?
AND VAREQ? (1,V36)
THEN
 INVIS (7)
ELSE
 VIS (15)
ENDIF