When comparing Open d6 vs Dungeonslayers, the Slant community recommends Dungeonslayers for most people. In the question“What are the best tabletop RPGs?” Dungeonslayers is ranked 3rd while Open d6 is ranked 22nd. The most important reason people chose Dungeonslayers is:
The rules are beautifully presented and succinctly explained. The basic rules are explained within 20 pages.
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Pros
Pro Includes rulebooks covering the more common genres
Open d6 includes rulebooks for Fantasy, Adventure and Space settings.
Pro No special dice required
The game can be played with common six-sided dice.
Pro A simplified variant, called Mini Six, is available
Mini Six is a fan-made variant of Open d6 that aims to be a distilled version of the Open d6 system.
Pro There are theme-related books available to start various types of games
D6 Space is West End Games old "Star Wars D6" game with all of the licensed Star Wars names removed. It's a stand alone complete game.
D6 Fantasy is a standalone ruleset for running a D&D type game with the D6 system.
D6 Adventure is a standalone ruleset for using the D6 system in a Wild West, spies, or modern adventure game.
All three have supplement books (Spaceship design, magic, aliens, etc).
Pro Each rulebook has a good introductory section
Pro Well written, lightweight ruleset
The rules are beautifully presented and succinctly explained. The basic rules are explained within 20 pages.
Pro Quick and Simple
Great for kids
Pro Fast combat system
DS uses a streamlined approach. It's typically possible to get through 3-4 battles in 2 hours.
Pro Complete with a hilarious working community
Presenting more that 30 fanbased works per year.