Tap on the bottom left and right corners to go backwards and forwards between the wings. ~Notes on the Opera House~ Although not shown in the project, the Opera is really a very complicated building, rising three stories high, the main stage and audience chairs open to all three. The Great Hall is the lobby of the building, lavishly decorated with chairs, side tables, a piano, and more. The Main Stage is very large, with sweeping crimson curtains behind it, and the audience seats are located in small circular boxes along the walls as well as on the main floor. Behind the stage is a maze of dressing rooms, secret passages, scaffolding, and other rooms that seem to serve no particular purpose. There is a wing of rooms behind the stage, as well as two that go along both walls. It's possible that there is a maze of subterranean passages below the Opera as well, where the Voice hides... It's not certain, however.
This project doesn't show the whole floor plan, it just shows the guest rooms. The Opera is really a sprawling, very intricate building.