Genocide City Zone (AKA Cyber City Zone) was a scrapped level from Sonic the Hedgehog 2 for the Sega Mega Drive. The level was originally a concept for the Metropolis Zone act 3. In a prototype release dubbed "Simon Wai Prototype", the level was originally assessable, but lead to a room where Sonic would just fall to his death. Activating debug mode would cause the appearance of a ring and a teleport monitor. The music that was intended to be used for this level was used for Chemical Plant Zone instead.
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There are many variations of Herobrine's behaviour, but they usually fall under two categories...