Unusually, Professor Tanner is standing in the corridor awaiting your arrival. She smiles and greets you, eager student that you are. As you step into the Arithmancy classroom-

Wait. Is this the Arithmancy classroom?

You appear to have entered a giant arena. Large wooden obstacles are whirring about at seemingly random intervals in likewise random paths. Metal grate platforms and towers are spaced in strategic locations. Pits filled with mud, areas of dense fog, passages in complete darkness, and many other dangers lurk.

Enter if you dare.