Voldemort has taken over the stories and altered everything so that the villains take over the world
year 1 Voldemorts Dream Deathly Magic Hagrid's Demise Sadness Hogwarts Hogwarts, I'm dead Can you Help Me
the levels have to do with the terrors looming and Harry has to set everything right and take over the world. year 8 does that while all the other levels are skipped. this is accessed through Harry Potter 8 Extended Cut.