I have been in the Collasium for a couple of days now, but can't seem to get anywhere. I have found two round crystals for door locks (the mermaid lady gave me one of them), but only one locked door. I have also found a revolving room, and obtained the first piece of the tablet on the other side of this room, but cannot get anywhere else? What am I missing? Please help me out. Thanks.

SPOILER SPACE
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Hiya,

Put one of those stones in the socket by the revolving door. Once inside, this will cause another one to open up, and will let you go to that area to get another tablet. You will see another socket here, and put your second stone in there to open up yet another part in the revolving room (there are 4 pathways).

This last one will lead you to the rest of the goodies needed to complete this part. It gave me a headache at first, but this should help you.

Good luck

Scronan