I Handed over the Double Door, and the Torrent of Steel Pushed Across the Other World

[Hand in the double door + steel torrent + technological explosion + push everything + rule the other world! Shen Xuan, who obtained the double door system, originally wanted to keep developing, but found that he needed a million people to form a team before he could enter the first dungeon. After much consideration, Shen Xuan decided to hand over the double door and lead the mighty torrent of steel into another time and space. [The double door opens, please select the world...] 1. The prehistoric world 2. Zombie Apocalypse After Shen Xuan led hundreds of millions of compatriots to develop a different world, Yingjiang thought that the Dragon Kingdom was still the same Dragon Kingdom as before, and wanted to make some small moves. However, when he turned around, he discovered that the Dragon Kingdom was already invincible outside the territory! Looking at the trembling nations, Long Guo reassured: "Don't be afraid, we love peace! Don't be nervous, don't resist, I'm just a little dizzy, I'll be fine soon..."