APK MOD INFO
Name of Game: Tower Defense Zone
VERSION: 0.0.6

Name of the cheat, mod, or hack (credits: wendgames):
-UNLOCKED

Tower Defense Zone MOD APK 0.0.6 (Unlocked)

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