There is a glitch that's caused by going down a pipe, pausing the game, and exiting the level with Select. When Mario enters any level, he'll go through the floor as if he was still going down the pipe. Through this glitch, Mario will usually fall into a visual representation of the game's RAM. Blocks, pipes and other graphics are seemingly scattered randomly and can do random things, such as give Mario coins, hurt Mario, complete the level or crash the game entirely. It's even possible to trigger the credits in this area.