[1]: Map squares in the middle of the sea are unreachable by normal players, making it impossible to obtain the keys for their loc groups. However, the loc groups for these map squares are empty. As XTEA does not hide the length of the compressed data, this service infers which encrypted loc groups are empty and includes them in the number of valid keys, regardless of whether we know the key or not. After downloading a cache from this service, a cache editor may be used to replace the empty encrypted loc groups with unencrypted replacements.