City of Wonders is a Half Life 2 mod, in which you are enclosed in an urban complex, with four men. You have to defend yourself against the hordes of flying aliens that will try to devour you! Please note, you will need Source SDK Base 2006 to play this mod. City of Wonders is a Half Life 2 mod. It was created with the Hammer editor of Half Life 2: Episode 1. Enjoy!