Halo 3

NOTE: YOU MUST START AT THE BEGINNING OF THE LEVEL. NO RALLY POINTS!!!!
INSTUCTIONS:The Skull is located in the level, "The Covenant". After defeating the Scarabs, and going inside, get to the location with all 7 Ring Holograms. You must jump through the rings in a specific order. That order is as follows (1 is at the entrance, 7 is at the end).

Code is 4 6 5 4 5 3 4

This code is shorter because someone at Halo3Planet discovered that you only need to enter the last half of the sequence for the skull to be activated.

Proof here. http://www.halo3planet.com/halo-3-skull-locations/iwhbyd-skull/

[Update: Now it's been confirmed that only the last 7 notes are needed.]

4 6 5 4 5 3 4

These ri...