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Codes For Heretic
Heretic

Go to the Cathedral (level 6) and flip the end switch. Do not complete the level. Instead, go back up the green key stairs and turn right. Go down the hall until you see an opening in the wall that was not there before. Enter it, kill the enemies, flip the switch to open another door down there. Go on the right "end" teleport to complete the level and travel to the Grave Yard.