Game's you've loopholed

[GameMaster]

Well, there was the whole Cinnabar Island affair in Pokemon Red and Blue. Surf along the shore to clone any of your items 99 times. Most popular item to clone was rare candy. And along those very same shores was the chance to encounter Missingno.

My very first loophole was accessing the debug system in Sonic 1. Which allows you to transform into various in-game objects and enemies and clone them right into the level. When you're transformed, you can pass through solid walls and literally just fly through to levels end. Sometimes if you go tooo high or too far the game freezes or you die.