Top: in World 8-4 in Super Mario Bros., there is an underwater section in a castle, the only one of…

Top: in World 8-4 in Super Mario Bros., there is an underwater section in a castle, the only one of its kind anywhere in the game. Normally, the player would simply emerge from the entrance pipe and continue to the right. However, if the player attempts to interact with the pipe, Mario will become hurt or even killed by something seemingly invisible. Bottom: if Mario is Fire Mario, shooting a…