If you've played the game long enough (several restarts after new releases) then you can use an editor for certain items, other items you'll still need to earn in order to prevent the game from going buggy. Some devs will allow this others seem to lock you or punish you out of the game (were talking the game itself) for trying it. I ran into a few where I was allowed to edit certain things (items, money) but if I tried to mess with the variables of the game, I would load up the game and nothing happened other then a dialog window telling me to stop messing with the game.