In his previous life, Zhang Yi survived for eight years in the Apocalypse world. By the later stages, he had gradually mingled with top-tier players, moving from an obscure level-three small city to the top-ranked level-one main city in the Star Nation's Heaven Ranking: Dawn City.

Therefore, Zhang Yi remembers the distribution of player main cities in the Apocalypse world quite clearly.

Main cities are divided into level-one, level-two, and level-three, from high to low. Players can only enter level-three main cities at level 30.

They are categorized by zones and factions.