A is a modified version of the original game file. A "signed" APK means the file has been digitally signed so it can be installed on an Android device without requiring "Root" access. Common Mod Features often found in these versions include:
Some versions include toggles for high damage or god mode to breeze through difficult boss waves. Safe Installation Guide Download Castle Defender Premium Mod Signed apk
Used for summoning legendary heroes and instant castle upgrades. A is a modified version of the original game file