I've heard that several old NES, SNES, and arcade games have minus/glitch worlds, which can only be accessed by exploiting a bug or glitch in the game's code. I have also heard them referred to as "kill screen", which more specifically refers to when you reach a level that is so high that the original programmers didn't code for it. This, naturally, causes the game to crash in a way that may or may not let you continue to play.
Which games have a glitch world, and how can they be reached?