Once again the gems of the evil forces are in danger! After a decade of peace the good heroes come again to steal the last 3 gems carefully saved by the evil Overlord. Your duty is to defend what was granted by centuries of the nefarious deeds. Build and upgrade towers, cast powerful spells and learn useful skills to protect the gems and smash all these ninjas, angels and lizard riders to pieces! tower defense, strategy game, gem defense, tower upgrades, spell casting, ninja defense, angel defense, lizard rider defense, classic tower defense, mobile game, action game, gems, strategy, tower, upgrades, defense, towerdefense, action, strategy, gems, defense