zombies being slow or fast depends on how the virus would work, if it is a virus that drives the host mad like in left for dead then they would be fast, but if the virus reanimated the body, then all the muscles would over time decay and break apart, that is more likely to occur
keep this comment alive!
 "Billy's Big Adventure 3: RPG Edition"){kind=icon}
 "Cosmic Crush"){kind=icon}
 "Remnants of Skystone"){kind=icon}
 "Particles"){kind=icon}
 "Big Truck Adventures 2"){kind=icon}
 "1066"){kind=icon}
 "assassin's creed quiz"){kind=icon}
 "Escape from really boring island 3"){kind=icon}
 "Extreme Missile Defense X-treme 3D"){kind=icon}
 "Portal: The Flash Version"){kind=icon}
 "Dead Frontier: Outbreak"){kind=icon}
 "Dead Frontier: Outbreak 2"){kind=icon}
 "Ultimate Assassin 2"){kind=icon}
 "Ninja Cat"){kind=icon}
 "Understanding Games: Episode 1"){kind=tracking}
 "WalkRight"){kind=icon}