Rumor has it that this is embattled Egyptian president Mubarak's favorite game. Although I think he might be misunderstanding the whole 'writing with Egyptian blood' thing...
Challenge #5 is tough. Here's some hints: 1)Go all nuclear to reduce smog. Build 3 plants ASAP. 2)Labs are the key to efficient power. Build a total of 2 or 3 of them as power allows. Level up your nuclear plants. Later, use the research points to upgrade your garbage trucks and switch off gasoline to natural gas. 3)The natural gas point in the north west is important. Defend if possible, keep clear of trash to rebuild if not. 4)Build 3 metal mines and keep the area free of garbage if they are destroyed. You need the metal to build defenses. 5)Bulldoze the coal plant. It provides free garbage and a power up to attacking zombies if it's destroyed. 6)Use a combination of all 4 different defenses to avoid relying on one resource. Light beacons only need one resource (power) so when you don't need to worry as much about power usage, flood the battlefield with them.. 7)The first night is always the toughest. Sometimes, there's nothing you can do.
 "Flagstaff: Chapter One"){kind=icon}
 "Guy of My Dreams"){kind=icon}
 "Flight"){kind=icon}
 "Castaway"){kind=icon}
 "Super Energy Apocalypse : RECYCLED!"){kind=icon}
 "IntoSpace!"){kind=icon}
 "Canabalt"){kind=icon}
 "Amorphous+"){kind=icon}
 "Pandemic 2"){kind=icon}