: Android requires all apps to be signed with a certificate before they can be installed. When a developer modifies the original game's code (to add "mods"), the original signature is broken and must be replaced.
A "signed" APK is a modified version of the original game that has been packaged with a new digital signature. Download Royal Adventure mod signed apk
: Features include global leaderboards and alliances for sharing tactics. Understanding "Signed" Mod APKs : Android requires all apps to be signed