20
0x0 light water
0x1 dark water
0x2 shoals
0x3 plains
0x4 snow plain
0x5 forest
0x6 snowy forest
0x7 rocks(barren land)
0x8 marshland
0x9 mountains
0xA base of mountain
0xB mountains(surrounded by snow)
0xC volcano
0xD cliff
0xE desert
0xF road
0x10 snowy road
0x11 open sky
0x12 walls
0x13 towns, buildings, castles