A virtual reality game
in the universe of Red Dwarf
where you get to live your fondest dreams, or at least what your unconscious mind
wants (which can be pretty miserable
if you don't have much self-esteem
). The player is not usually aware that it's a game while the game is going on, so it is very difficult to get out of the game and back into real life.
Also the name of an episode of Red Dwarf and the second Red Dwarf novel released under the name of Grant Naylor.