Opera House

How do I kill the guard waiting for me below the entrance to the level?
How do I get over the spiked area just near the entrance?
I'm past the spikes, but I need a key to get in the opera house.  Where is it?
I'm on a partial roof above the opera house, but it collapses when I cross!
I've found a solid roof above the opera house.  How do I get inside?

I'm in the opera house, and I see two switches.  What does the right one do?
I got into another area by pulling the left switch, but I can't go very far.
How do I operate the elevator?
How do I get through the area with a series of fans?
How can I exit the dressing room?
Where's the exit from the opera house?
How do I kill the boss at the end of the level?

Secrets

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