I found it - das fliegende klassenzommer

Children live in a boarding school and a new boy arrives. They find the script of a play in an abandoned railway car and decide to stage it. There was also a snow battle in a housing estate. And a boy jumped off the roof with balloons on his back. I saw it on youtube and maybe it was a german movie


The poster found the movie himself. I am posting it here so we can close this post.

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