Realm Defender Home Realm Defender 0.0 / 5 ( 0 votes ) Your Rating? Discover Realm Defender – Play Free Now on GameHard! Realm Defender - Welcome to new beautiful 3D version of the tower defense game. Build new towers to defend your castle, just click to place a tower and defend your castle against the enemies. Control the game only with the mouse and complete all the voxel levels. Categories in which Realm Defender is included: 1 Player