Let Me Make a Copy, and You Will Build the Wuchang Great Wall Watch?

Alien invasion! The 197 countries in Blue Star simultaneously form 197 country dungeons to resist as levels! And as one of the five most powerful dungeons in the world! The so-called purgatory-level dungeon [Raging Waves] only lasted for half a month before being breached by aliens, causing people around the world to despair! At this point, only one of the five strongest dungeons in the world is left, and it is also the last hope of mankind - [Great Wall Watch]! Just at this time. Jiang Chen was reborn and returned to the three months before the alien attack. He looked at everything familiar in front of him and resolutely chose to hand over the copy of the design drawings! Ever since! [Copy: Great Wall Watch] [Difficulty: Purgatory] .....