Do you like playing with the infected once you finished?

[WindexGlow]

You can edit their speeds, how far they can see you, ect by editing their files.
[penumbra dir]\Redist\Models\Characters\Infected\Character_Infected.ent

Some of them have numbers at the end of them; I believe this refers to what level they appear in (go to redit\maps to get a simple understanding of what the number means)