Weird Game: I brought an old version bug

One day, a survival online game called "Abyss Game" was launched globally. There was no way to quit; death meant certain death. On the surface, it was a traditional MMORPG—leveling up by fighting monsters, teaming up for dungeons, acquiring equipment and skills, and having different job classes. Five billion people worldwide were trapped within it, order collapsed, and game guilds replaced government institutions.
This isn't the first time this game has been run. Before the "current version," there was an older version—different rules, different maps, even slight deviations in the laws of physics. Most of the data from the older version has been wiped, but one "person" wasn't completely erased.