What do I do here?

Hint 1 of 6:

You need to get into the inner rooms.

Hint 2 of 6:

Pick up the blue snake rod.

Hint 3 of 6:

Take as many loose tiles as you can find.

Hint 4 of 6:

Arrange the tiles correctly.

Hint 5 of 6:

Arrange the tiles from 1 to 12.