APK MOD INFO
Name of Game: Block Tank Wars
VERSION: 3.5

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

Block Tank Wars MOD APK 3.5 (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