There is a secret world in the game Super Mario Bros (NES), called minus world -1
One of the amazing secrets NES Super Mario Bros. is the world or Minus World -1, this world is accessed through a wall and consists of a water phase, although it reaches the end, a pipe (the only output) takes Mario back to the beginning of phase, so if you come to World -1, Mario is sentenced to die, either by enemies or by time.
Here's a video:
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