Hi, what is the 16th bit in "water_and_edge" in w3e used for? Is it always 0? According to your spec (and code), the 15h bit is whether the tile is on the map edge). Then in your code, you do the & of "water_and_edge" with 0x3FFF which just applies to the first 14 bits in binary: 0011 1111 1111 1111. Is the 16th bit used for anything?