I've read some of the posts about this, and it seems I have to toss a pyramid stone across to a little island and then transport across.
The only island I can see that can't be accessed by walking or by a transporter stone is the one immediately to the left of the first transporter stone you come to. I have tried and tried and tried but I am not able to toss my pyramid stone across - it just bounces back to my inventory.
I have also tried to do this from the other island - the one you get to if you use the first transporter stone, but you can't see the other island at all from there.
I have cleared as much of the black fog as I can from both sides of the island, and I can actually see a corner of the third transporter stone on the island, but even if I try to toss the pyramid stone onto the area next to it, nothing happens. No matter where I try to place the stone on that island, I just get the red "X".
So how do I do this, before I get completely frustrated?