MAP30 - Brutal Doom II (Secrets marked, Pistol start + Much faster enemies)
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No Secrets.
MAP30: Icon of Sin (Doom II)
Brutal Doom v19. "12 in a 10 point scale" difficulty (much faster enemies) with pistol start.
John Romero explains the story of the easter egg in this video: http://youtu.be/YUU7_BthBWM?t=1h4m13s
Trivia from http://doom.wikia.com
Using the idclip cheat code to pass into the head of the final boss reveals the violently severed head of John Romero, impaled on a spike. This is unreachable by normal means and does not register as a secret, but can be considered an easter egg (it can be reached by being hit by an Arch-Ville from the rear, while jumping forward from the top of the pillar. This will launch the player directly forward with large momentum, throwing him into the forehead gap). Shooting it also ends the level. A side note to this Romero-on-a-stick, when the player enters the main battlefield, he/she is greeted with an arcane chant recited by the boss that can be spelt as "Oremor noj eem lick tsum ooy maig uth niw oot". If recorded and played backwards (making it the "correct" playback), it is actually John Romero's voice (distorted and reversed) saying "To win the game you must kill me, John Romero".