3. Cheating
Cheating is not allowed. Everyone ever found using cheats, on any server, will be permanently banned from joining L4D2Center, with a very small chance to get unbanned in the future.
Bypassing serverside addon disabler: the only correct place for your addons is left4dead2/addons folder, or left4dead2/addons/workshop
Modifying game files, such as sound files, or any other (except Infected vision filter, you can delete/modify it)
Bypassing the L4D2Center Anticheat, altering the app memory or spoofing the data it sends or receive
Automated bunnyhopping
Aimbot
Anything that moves your crosshair for you (180 degree turn scripts, ceiling jump helpers) (except left&right arrows, they are allowed)
Anything that presses buttons for you (m1 helpers, double-click button on mouse)
Wallhack
Fakelag
Speedhack
Teleportation
Anything else that gives you unfair advantage over other players. If you are unsure about some thing being considered a cheat, better ask admins before using it.