I am in the oracle temple, have completed the middle tower, and obtained the first hourglass. But, when I go to the left tower and find the doorway with the shadow of the hourglass, nothing happens. I cannot see the hourglass in my inventory. If I stand in front of the hourglass shadow or the door then hit enter, nothing happens. I have gone back through the middle tower and the left tower a couple of times, but it didn't help.
Can anyone help me? Do I need to start the game over?
Thanks in advance for your help.