National Tower Defense: I Can Upgrade the Defense Tower Infinitely!

Su Chen traveled to a strange world of national tower defense. In this world, human beings are trapped in dangerous buildings, unable to take even a step out. Every day, trillions of dark creatures, including losers, witches, undead, alien beasts... Attack humans. Outside the dangerous building, there is endless darkness. Su Chen, who came from time travel, awakens the infinite upgrade system at the beginning! "Ding! The alloy arrow tower has killed 100 monsters and can be upgraded to an alloy arrow tower!" "Ding! The super turret has killed 1,000 monsters and can be upgraded to an infinite cannon!" "Ding! The Shield Warrior has killed 5,000 monsters and can be upgraded to the Iron Warrior!" … While others were trembling in the darkness, Su Chen had already built his own city! While others are struggling to survive, Su Chen has launched a counterattack against the darkness! Super evolved titanium warrior! Galactic Fleet! Laser starship! Su Chen suddenly turned the national tower defense into a monster-slaying feast! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.