The Hogwarts 1990 campaign is played using Draco Dormiens, a DOUBLE-12 game of roleplaying and adventure at Hogwarts School of Witchcraft and Wizardry. I invented the DOUBLE-12 core mechanic for this game but it could be applied to other systems and settings.
Posted below is the fourth beta version of Draco Dormiens. (beta v0.4.0)
PLAYING THE GAME
RUNNING THE GAME