No More Heroes did it fairly well. You just start the game over with all of the money and upgrades you had at the end of your previous game. For the most part you can just blast through all of the Rank Battles without having to do any of the side quests to pay the entry fee. Nothing really gets unlocked, but it's at least a good way to re-experience the game without the 20-40 minutes of grinding in between levels for money.