Polyhedron Magazine
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Polyhedron was from 1981 to 2002 the official newsletter of the RPGA, after which it became a flip-over section published on the back of Dungeon Magazine for two more years before Paizo put it out of its misery. During the Paizo years, the magazine published a bunch of d20-based minigames and conversions of other existing games, which were usually pretty interesting if poorly balanced.