The answer is yes and no, only if you complete the game, then you can repeat the game with your new upgrades, lightsabers, Force powers, etc. There is no level select, you have to play the levels in order. Hope that helped.
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It isn't possible to skip any levels on Lego Harry Potter.
You have to be amazing
in the end you can choose to fight him or the emperor
You can't. It's one of the downsides of the game; you have to play it as a story--in order. Even if you beat the game, you still can't choose what level you want to play.
Including the prologue, there are 10 levels.