However, there is a cooldown period between the doors, meaning you can't open them one after another without a gap.
The story that unfolds later is something everyone knows.
The first door leads to the 1665 simulation.
The opening points for this simulation were gifted by the halo; Xu Yun met young Newton there and completed the rookie quest.
The second door is the 1100 simulation.
The time is the Northern Song, and Xu Yun caused quite a stir.
The third door is unknown, and hasn't reached the conditions for opening yet.
Another point worth mentioning.
Before the second door opened, Xu Yun gained 107 knowledge points through a cockroach extermination live broadcast.
At the time, those 107 knowledge points were distributed with 7 going to the 1665 simulation, bringing it to '10/100'.
1100 simulation got 100 points, which unlocked that chapter of the Northern Song.
Later, the Northern Song simulation ended.
