why this code don't apply my requirements please

please help me, why this code don't apply my requirements

-My problem that i have wrote a program in pic basic to design a game and control it; and the code doesn't apply what i want (pratically) and also in the simulation....
-This is notes about the game (my requirements in the game).... plz read it and tell me what's the problem in my code..
-Thanks in advance...

Notes: -it is a game depends on laser beams designed
like a control system contolling the
safety of a safe for example
the player has a 3 opportunity to interrupt
the laser beam and then he loses the game.
every interruption of laser beam;
a led is activated till
the 3 opportunity are ended and
then a sounder is activated indicating that the
the player loases the game
-i used pic16f877a
-portc.5, portc.6, portc.7 (to control the 3 leds that indicate the interruption of the laser beam)
-portc.4 (to control the sounder if the player ended his 3 opportunity)
-portc.3 is to control the activation of a led if the player wins
-the first LDR is related by the LDR before the final one and the two are in series with resistor 10k?
-the second LDR is related by the final LDR and the two are in series with resistor 10k?
-each LDR is in series with a resistor 10k?
-the resistance of the LDR in the presence of the laser beam is between 5KΩ
and 6KΩ


THIS IS MY CODE

'**********************************************
define adc_bits 8
define adc_sampleus 50
'***********************************************
adcon0=%11000001 'to active analog module and set all porta as
'analog to digital conveter
adcon1=%00000000
trisc=0
'***********************************************
'define varriables
adc_result0 var byte
adc_result1 var byte
adc_result2 var byte
adc_result3 var byte
adc_result4 var byte
adc_result5 var byte
adc_result6 var byte
adc_result7 var byte
bn var byte
c var byte
mask1 var byte
mask2 var byte
'***********************************************
'initialize the values of the varriables
portc=0
bn=-1
c=0
mask1=0
mask2=0
'***********************************************

'main function


main:
adcin 0,adc_result0
adcin 1,adc_result1
adcin 2,adc_result2
adcin 3,adc_result3
adcin 4,adc_result4
adcin 5,adc_result5
adcin 6,adc_result6
adcin 7,adc_result7

if adc_result0<140 then c=1
if adc_result1<180 then c=1
if adc_result2<180 then c=1
if adc_result3<140 then c=1
if adc_result4<140 then c=1
if adc_result5<140 then c=1
if adc_result6<140 then c=1
if adc_result7<140 then c=1


if adc_result0>140 then thebegining
if adc_result1>180 then again
if adc_result2>180 then again
if adc_result3>140 then again
if adc_result4>140 then again
if adc_result5>140 then again
if adc_result6>140 then again
if adc_result7>140 then mask1=5

goto main

Thebegining:
if mask1=5 and mask2=10 then 'if the player interrupts the first and the last
'laser beam ---> active a led indicating
portc.3=1 'the victory of the player
goto main
endif

'again: is the function followed when the player interrupt a laser beam

again:
if c=1 then bn=bn+1
c=0

select case bn

case 1
portc.5=1

case 2
portc.6=1

case 3
portc.7=1

case 4
portc.4=1
pause 3500
portc.4=0

end select
'***********************************************

goto main

end

maybe you are posting in the wrong thread.