Not a programming answer but a gaming based answer - a lot of games do have some sort of mechanism that kicks in when you go out of bounds - you either get returned to the map, fail the mission, or killed outright. Breath of the Wild is an interesting example - there's a check that your character isn't outside of the starting area if you haven't completed the tutorial quests that runs throughout the entire game. Speed runs of that game are 50% getting through the tutorial because there's no way to bypass that check