The End of the World: Kill Monsters, Explode Materials, and Become Infinitely Stronger

The world suddenly changes, zombies attack at the doorstep After Fang Yu fought back with all his might, a line of red letters floated above his head: [Kill zombies and pick up material balls to obtain random materials. [Strength value permanent +1] Kill monsters and you'll be full! Kill monsters and survive! You can become infinitely stronger by killing monsters! Even though the zombies became stronger again and again, he never stopped and never changed his goal. Start with a knife and kill from darkness to dawn.