Since he often encountered situations like this, Zhang Yanhang had grown quite accustomed to it by now. After recalling the relevant routes in the vicinity, he headed straight for the last dozen or so Crimson Iron Worker Ants in the fourth area.
After picking up the sole White Treasure Box dropped by those worker ants, Zhang Yanhang formally confirmed that he had successfully cleared the entire fourth area, and since there were only eight areas in total to clear in the First Tier, his completion rate for this stage of the cleaning plan had reached fifty percent.