This hack features:
ALT + C = Channel Spam
ALT + L = Lawnmower
ALT + S = Speed Hacks
ALT + F = Fly Hacks ( Note: It teleports you to the middle of the map )
ALT + P = Anchor Lock
ALT + B = Turn VoidStep / Slow Lawnmower On/Off
ALT + Y = Save Current Location
ALT + H = Teleport To Saved Location

Hotkeys:
ARROW UP = Increase Speed Hacks Speed
ARROW DOWN = Decrease Speed Hacks Speed

While Speed Hacks On,
Key W = Move Forward Fast
Key A = Move Left Fast
Key S = Move Backward Fast
Key D = Move Right Fast

While FlyHacks On,
*Point Your Cursor to where you want to fly

Key W = Fly Forward
Key A = Fly Backward

While VoidStep On,
SHIFT = Void-Step / Slow Lawnmower

How to use:
1.) Download the hack
2.) Extract It Somewhere That U Will Remember
3.) Copy the files in the hack's folder to the GunZ ijji folder
4.) Execute GunZ
5.) You should hear a beep when you click on start game, otherwise you did it wrong

Download
GunZ Online Hack - xPublic