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you try to beat it
you beat a sertan misson
You zap it until you beat it
you dont
you shoot the patronus charm at them.
After you have 100%, acquired Voldemort and rampaged the city, the game is essentially over.
There are several versions of LEGO Harry Potter. Each one has a different ending. Sites like GameFAQ and IGN have walkthroughs for the entire games for free. It is best to find a good walkthrough and get the details for the exact part that you are having trouble with.
beat the first level and press return to leaky cauldron.
To complete the whole game, you have to have purchased all of the characters and items as well as complete all the levels.
One of the men has a shovel, so you use him to get past this level.
To beat the dragon, you have to look on Youtube and watch walkthroughs on how to do it.
Beat the game yourself and create your own walkthrough, don't make other people do it for you