CodyCross - Answer Roman emperor began construction of city walls

CodyCross

CodyCross is a recently released game developed by Fanatee. It is a crossword puzzle game and has many fun words, separated into different worlds and groups. Each world has more than 20 groups with 5 puzzles each. Some of the worlds are: Planet Earth, Under the Sea, Inventions, Seasons, Circus, Transportation and Culinary Arts.