1 CAN ALWAYS WALK
    2 CANNOT WALK THROUGH WALL
    4 FENCE - KEEP ENNEMIES IN
    8 CANNOT FIRE THROUGH WALL
   16 ?
   32 ?
   64 ?
  128 ?
  256 ?
  512 ?
 1024 ?
 2048 ?
 4096 ?
 8192 ?
16384 ?
32768 ?