We have just released Goals for the City Sewers world. At every level you have a new goal to complete related to City Sewers. Each level gets harder to complete but you will receive a prize for completing each level. The City Sewers Goals are the 18th world to have goals and currently has 25 levels for you to complete.
City Sewers Goals have been added to the City Sewers world map and the Goals page. You also have a new profile shield.