Just Completed KH1

[Marcus]

So yeahh just finished it as of now, but wondering if there is a save thing similar to FFXIII where i can continue with the sidequests even though i have defeated ansem :hmmmm:
i only want to know because i gained like 10 levels battling him and i dont want to lose them

 

[King Sean]

You will have to reload a save before the battle with him and leave the world to do any side quests you haven't done yet. You can't save after that battle.