anchor.diff:  
   turf
   	ror1
  +		Enter(atom/movable/O)
  +			if(density && isplayer(O) && O:ror == 1)
  +				return 1
  +			else
  +				.=..()
  +
   		Entered(mob/Player/M)
   			if(!ismob(M))
   				return
  
positive.code: 
  turf
  	ror3
  		Entered(mob/Player/M)
  			if(!ismob(M))
  				return
  
negative.code: 
  turf
  	ror2
  		Enter(atom/movable/O)
  			if(density && isplayer(O) && O:ror == 2)
  				return 1
  			else
  				.=..()
  
  		Entered(mob/Player/M)
  			if(!ismob(M))
  				return
  