In the 22nd century, the giant enterprise "Tianqiong Group" rules the world. In order to manage the excess population and vent the grievances of the grassroots, they built the huge three-dimensional city "Babylon" and forcibly activated the "Abyss Game" - the entire city became a survival game field that cannot be exited.
Everyone is a player: Every citizen is implanted with a "personal terminal" at birth, and his field of vision is filled with the game UI: life bar, level, skills, and equipment columns.
Currency unification: Traditional currency is abolished, and the only thing in circulation is "credit points", which are both money and life span. Credits are spent or earned by working, completing tasks, and even breathing (base survival tax).
Solidification of class: Class represents everything. High-level people live in the sunny upper "Eden Zone" and enjoy clean air and real food. Low-class people struggle in the lower "Rust Belt", accompanying themselves with sewage, neon and violence.
Death rule: When the credit points return to zero, or the personal health value is cleared, the terminal will release a neurotoxin and perform "account cancellation processing". This gives the "game" an extremely brutal sense of realism.
