How and where do you get the fourth Shifter Spirit? Details would help.

Which world/section of the game are you currently in?

The palace one. I'm supposed ot get the genie, I guess. But I've searched the whole place.

Well, you really don't get specific shapes in certain areas. What happens is that you'll find a crystal for a new form, and you choose which one you want next. I had the same problem when I was in the desert and I chose to get the Genies before the Skeletons and thus could not access certain areas of the pyramid.

Hmm yeah, I might have to restart and all. Because I got stuck in the palace. Right after the area with the jars.

Yeah, you're definitely stuck if you don't have the Genie form in that part of the game. When you restart your game, I suggest going in the order they present the forms to you. Get the beast form in the castle, the skeleton form at the pyramid, the genie form in the desert city, etc. etc. Match form to stage, OR, if you want to be naughty you can use the Get All Forms cheat that I posted in the Cheats Section of the forum. LOL.