APK MOD INFO
Name of Game: Rage Z: Multiplayer Zombie FPS
VERSION: 1.10

Name of the cheat, mod, or hack (credits: wendgames):
-x2 DAMAGE
-ALL UPGRADES AND UNLOCKSCOSTS 1 GOLD AND COIN
ALL ITEMS REQUIRED FIRST LEVEL TO BE UNLOCKED

Rage Z: Multiplayer Zombie FPS MOD APK 1.10 (x2 Damage & More)

Download the CACHE file/OBB file. They should be .zip or .rar files.
Extract the file to your sdcard.
Move the extracted folder to the location: /sdcard/Android/obb