During the mission 'No Escape,' walking through a specific wall near the VCPD reception desk transports the player into the Ghost World — meaning Rockstar's own scripted mission accidentally contains a doorway to a glitched universe.
Source: Ghost World (GTA Vice City) — CC BY-SA
A glimpse into the Ghost World — the glitched void you fall into by clipping through that VCPD wall during Rockstar's own 'No Escape' mission.
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