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Level 263 is the 264th level of the Progressiverooms. It is a series of railroads covered in snow, in which only one train carrying cars with coal will appear every 6 hours. The level is unsafe due to its number of hazards such as the low temperature causing hypothermia and possibly even blacking out.
One might think those are the only hazards, however, 'mirages' can form in Level 263, one example is the belief that the train that passes has eyes, that glance at the individual who gets caught in the mirage. Others also believe that the train is moving away from the individual, which can actually cause a big hazard, which may bring one to believe the train will not hit them because it is moving away. Around 4 people as of typing this had died from such mirage. It is impossible to tell which mirage you'll get and when you'll get it.
Somewhere in Level 263 lies a buried television, which plays static until approached, in which it will enter a standby screen and will start slowly making you restless, until you fall into unconsciousness and wake up eventually in Hole Room.
Dr. Doctor (Proxied by Jacob Lee)