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The door to elevator B won't open

1. Think back. Where's elevator B?
2. It's on the lower level, where you left it. That's why the door doesn't open.
3. There's no call button here, so you need to get it to the upper level before you get to this point.
4. Try retracing your steps.
5. Notice that on the lower level, there are two call buttons for elevator B.
6. You can send the elevator either up or down.
7. Use the upper button to send elevator B to the upper level so it'll be there when you need it.

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