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Sync On

Do
   GoSub Subroutine
   Sync
LOOP

Subroutine:
   StageOne:
      // Colour screen red
      CLS RGB(128,0,0)
   
   // At this point, code jumps back to the Do-Loop block
   return
   
   StageTwo:
      // Colour screen grey
      CLS RGB(128,128,128)
   return
return

gosub Stage1
gosub Stage2
gosub Stage3
// this stops you accidentally running into the Subroutine's code
// when you think you've finished
end
 
Stage1:
   // Put some code here
   GoSub StageOne_Subroutine0
   GoSub StageOne_Subroutine1
// Now return to wherever called "GoSub StageOne"
return

StageOne_subroutine0:
 `codes
 // Return here will return you to the StageOne subroutine
return

StageOne_subroutine1:
 `codes
return

 
 
Collision:
 gosub Stage2 `I think the problem would start here? 
 // No problem whatsoever...
Return

Stage2:
 `Stage2 codes same with Stage1
Return

Stage3
 `Stage3 codes same with Stage1 and Stage2
Return

sync on : sync rate 60
level = 1
gosub setup



Do
    // move player
  
    // move enemies
  
    // check collision
    gosub Collision
    // check portal
    gosub CheckPortal
    sync
Loop
end

CheckPortal:
// check player's coordinates
   select level
       case 1
            // check coordinates for level 1
       
       endcase
       case 2
            // check coordinates for level 2
       
       endcase
       case 3
            // check coordinates for level 3
            
       endcase
   
   
   endselect
return

Collision:
    // check collision of player versus world
    
    // check collision with player to enemies
    
    // check collision of player with enemy shots / bombs / etc.

return

setup:
select level
    case 1
         // load level 1
         
         
    endcase
    case 2
         // load level 2
         
    
    endcase
    case 3
         // load level 3

    endcase

endselect
return