How do I get up the staircase

Hint 1 of 7:

You need to find another way up to the second floor first.

Hint 2 of 7:

The closet is a great way to get up the second floor.

Hint 3 of 7:

Did you notice the pegs in the closet?

Hint 4 of 7:

Try pulling one. The closet is an elevator.

Hint 5 of 7:

The third peg will take you to the second floor. Pull on it.