causes. For example, the player does not buy "Laser Vision" to cause an energy blast, but instead buys the effect "Energy Blast", which specifies that it caused by a laser beam emitted by the hero's eyes. Each effect can be modified by Advantages (less energy expenditure, for example) or Disadvantages (reduced number of uses, for example) which increase or reduce the cost of a power. Skills resolution As with all games using the Basic Role-Playing rules, skill tests and combat are resolved by rolling percentile dice against skills. Rolls that are much lower than needed can result in increased effect, while high rolls can cause critical failures. Combat rules have many options and take into account three types of energy for damage: Kinetic, Electric, and Radiation. Publication history In 1982, Chaosium published World of Wonders to demonstrate the flexibility of its generic Basic Role-Playing System; the game included three separate settings with the idea that player characters could be moved from setting to setting using the same rules system: a fantasy setting called Magic World a science fiction setting, "Future World" a modern-day superhero setting, Superworld The following year, Superworld was published as a stand-alone boxed set designed by Steve Perrin, with interior illustrations by Chris Marrinan, Markus Harrison, and cover art by Michael Dooney. Three supplements followed: Trouble for HAVOC (1984), three linked Superworld adventures by Stephen Perrin, Yurek Chodak, Donald Harrington, and Charles Huber. The adventures could be converted for use with rival superhero games Villains & Vigilantes or Champions. Bad Medicine for Dr. Drugs (1984), a Superworld adventure by Ken Rolston: Teen-aged heroes try to uncover a drug distribution ring in their high school after a classmate dies of an overdose. The adventure could be converted for use with Champions. Superworld Companion (1985), a rules supplement that included new super powers, a detailed plan of a superhero base, and effects of climate on play. Up against well-established rival superhero games Villains & Vigilantes (Fantasy Games Unlimited) and Champions (Hero Games), Superworld was not able to establish a strong player base, and no further supplements were released by Chaosium. Reception Jon Sutherland reviewed Superworld for White Dwarf #51, giving it an overall rating of 7 out of 10, and stated that "This represents an intelligent attempt to provide a playable format for a difficult topic to simulate. The only rules that I have ever seen with anything like