Purple:
Game Room. Go near the pool table. Defeat the giant spider. Now jump on the table and ... Poof! The pool player will try to hit you with the cue ball. Stand behind the other balls to have to cue ball hit them. Ghost will come out if you get of the pool table. Once you sink all the balls flip the switch and BAM! One down four to go. Orange:
Ball/Organ Room. Approach the organ and be blown back. Let the spiders pull you in with their webs. Then move towards the next spider farther back. When two webs are pulling you kill the spider the farthest from the organ. Once you reach the organ a enormous spider will fight you kill and turn on the lights. Mr. Thorn will come back. He always does. BAM! Two down three to go. Yellow:
Pantry. Kill all the riff raff and then climb the barrels and move the painting. Go into the newly opened area. Straiten the picture on the far wall and then jump into the portal. Now go over to the gate. If the door is blocked then find another picture, I can't remember. I think you should be able to go strait to the gate. Turn the handle to open the gate as far as you can. Now as quickly as possible run back to the portal, jump in and then run to the gate and enter. Duel Mr. Thorn yet again. BAM! Three down, two to go. Blue:
Sun Room: Kill all the enimes in the area. Head back towards the door and then turn around to find two Knights giving you a chase. Destroy them. Now return to the window and touch the handle. It will now follow you and let you turn any mirror in the room. Have the ray of light go all the way to the orb in the back of the room. BAM! Four down, one to go. Red:
Big room or something like that. Step on the rugs to change the walls. Assemble the stairs and then climb them and flip the switch. There you go. All the Soul Gems.

Ghosts:
First room you start in. Blast them any kind of way or turn on the lights

Spiders:
Mostly in every room. Lock on and blast them any kind of way

Giant Spiders:
The Game Room. Blast them in any kind of way and watch out for their webs

Floating Maidens:
The Kitchen. Keep your distance and blast them in any kind of way

Skeletons:
The Graveyard. Wait for them to lower their sheilds and blast them in any kind of way

Gargoyles:
The Mausoleum. Hit them with either the purple, blue, orange, or red gem watch out for the tiny monkeys!

Knights:
Fireplace Room. Stun them with blue, and keep them in one spot with multipule reds

Grim Reapers:
Kid's room. Hold the lock on button and mash them with rapid fire shots!