Comment Old games were more difficult (Score 1) 178
Another reason cheat codes existed is that without them, a lot of players couldn't finish the game. I think there are several reasons for this: the arcade roots, a larger percentage of hardcore gamers, the need to prevent the player from finishing an expensive game quickly after buying or renting it and game design being a much younger discipline.
Don't get me wrong, I actually prefer today's easier games, but it does mean that you don't really need a cheat code anymore to finish most games. Instead of having the difficulty increase a lot as the levels progress, games now have selectable difficulty from the start and achievements to add challenge for more talented and/or experienced players.