0x1 makes it impossible to move diagonally from a tile to the one south-east of it
0x2 makes it impossible to move south
0x4 makes it impossible to move diagonally from a tile to the one south-west of it
0x8 makes it impossible to move west
0x10 makes it impossible to move diagonally from a tile to the one north-west of it
0x20 makes it impossible to walk north
0x40 makes it impossible to move diagonally from a tile to the one north-east of it
0x80 makes it impossible to walk east