Grukkle Onslaught: Defend the blue portal in this thrilling tower defense game! Strategically place towers to fend off waves of enemies and protect your gateway. Master strategy and quick thinking to emerge victorious. Play now and prove your skills! tower defense, strategy game, arcade, survival, portal defense, Grukkle Onslaught, mobile game, PC game, tactical, enemies, waves, upgrade, gameplay, best tower defense, free tower defense