West-End Theatre
A 922-seat proscenium house on three genuine levels, Stalls, Dress Circle and Upper Circle, stacked as separate floors around one stage, with opera boxes at the sides.
Levels are floors, not decoration: you switch between them in 2D the way a buyer does, or view all three as stacked decks in 3D.
Try switching to the Upper Circle, adding a Concession tier to a block, or previewing the house as a buyer and flying to a seat in 3D.