A term used in video games to describe the outside of the main game area or map. It can be accessed either accidentally, or through the use of a no clip cheat/code. Blue Hell can often contain objects hidden from the map/area by the map designer, for example, in Counter-Strike or GTA3.
Word thought to have been invented by British comedian Stephen Fry, in a comedy sketch parodising the British game show Countdown, where he used that word as the conundrum. The presenter of Countdown, the late Richard Whiteley, said that Sloblocks was his favourite swear word in an unaired promotion for Channel 4. It could be used as a substitute for 'bollocks'.