Kill the ghosts until you get a orange key

when you enter, kill zombie rats until you get a red key. Use this key on the north-west door. Then go up. -Kill the ghosts, until you get a orange key. Use on the 2nd north door. Then go up. -To get a yellow key, kill skeletons in this room. Use on the most west door. Then go down all the way until you meet the zombies. -Kill them until you get a blue key. Make sure you use on the blue one, not the brown one. -Now kill Melzar the Mad to get the magenta key. Use on the magenta door. -Finally, kill the lesser demon, and then use the green key on the green door. Make sure you SEARCH THE CHEST first, or you will not get the piece. Then get out after you have the piece.