Level: The Covenant
Location: To trigger the appearance of this skull, you must jump through the rings leading up to Truth in a certain order. This will only work after the cutscene that depicts Truth's death.
The rings can be considered as numbered from one to seven (one being the ring closest to the entrance, seven being the ring closest to Truth's location). The sequence is: 1-3-4-6-7-5-4-6-5-4-5-3-4.
If you jumped through the rings in the correct order, the skull will appear on the platform just before the bridge that led to Truth.
This video is from our unofficial game guide. You can view the full guide here
Added 22nd May 2009, ID #1027