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1In the context of tabletop RoleplayingGames, a '''Rules Conversion''' is an attempt to run a game built for one roleplaying system in another roleplaying system. In some cases, this is supported officially, with conversion guides or sourcebooks published with the original game creators' approval. Some of these works only provide the converted material from the original game, while others may include rules and guidelines to help players convert material to the new system themselves - and some do both. Numerous official conversions from other games have been released as TabletopGame/{{GURPS}} or MediaNotes/D20System sourcebooks.
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3In other cases, conversion guides are written by other players who have done this before. ''{{TabletopGame/Rifts}}'' and other Creator/PalladiumBooks games are usually played in converted form, since the [[Creator/PalladiumBooks Palladium]] system is unpopular (although doing so publicly often leads to cease-and-desist orders from Palladium, who do ''not'' take kindly to the practice at all). When players convert games, they often use the GURPS, TabletopGame/HEROSystem, and MediaNotes/{{FUDGE}} roleplaying systems, since these systems are specifically built to accommodate conversions.
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5Rules conversions fall into two broad categories:
6* "Counts As" conversions. For each item or character trait in your game, find an equivalent one that is already present in the target system.
7* "Remake" conversions. Modify the rules of your target system so they can accommodate the material you're converting to it.
8Most rules conversions contain some elements of both.
9----
10!!Examples:
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12* ''TabletopGame/{{GURPS}}'' official conversions (from Creator/SteveJacksonGames unless otherwise noted):
13** ''GURPS [[TabletopGame/CarWars Autoduel]]'' (conversion from one of their own games)
14** ''GURPS Blue Planet''
15** ''GURPS TabletopGame/BunniesAndBurrows''
16** ''GURPS TabletopGame/CastleFalkenstein''
17** ''GURPS TabletopGame/ConspiracyX''
18** ''GURPS {{Cthulhupunk}}'' (includes conversion guidelines from TabletopGame/{{Call of Cthulhu}} to GURPS)
19** ''GURPS TabletopGame/{{Deadlands}}''
20** ''GURPS TabletopGame/InNomine'' (conversion from one of their own games)
21** ''GURPS {{TabletopGame/OGRE}}''
22** ''GURPS TabletopGame/PrimeDirective'' (published by Amarillo Design Bureau)
23** ''GURPS TabletopGame/MageTheAscension''
24** ''GURPS TabletopGame/VampireTheMasquerade''
25** ''GURPS TabletopGame/WerewolfTheApocalypse''
26** ''GURPS TabletopGame/{{Traveller}}''
27* d20 System official conversions (published by various companies):
28** ''TabletopGame/BigEyesSmallMouth''
29** ''TabletopGame/{{Call of Cthulhu}}'' (the core rulebook includes conversion guidelines from the original {{Basic Roleplaying}} version to d20; these guidelines are expanded further in the ''Call of Cthulhu Gamemaster's Pack'')
30** ''TabletopGame/{{Deadlands}}''
31** ''TabletopGame/LegendOfTheFiveRings'' (the d20 version has conversion guidelines for Alderac's previous editions)
32** ''TabletopGame/PrimeDirective''
33** ''TabletopGame/SeventhSea'' (as ''Swashbuckling Adventures'')
34** ''TabletopGame/{{Silver Age Sentinels}}'' (includes guidelines to convert material from the d20 version into the original {{Tri-Stat}} version)
35** ''Franchise/StarWars'' (not a conversion per se, but the original version of the core rulebook includes guidelines to convert material from West End Games' ''TabletopGame/StarWarsD6'' RPG)
36** ''{{Traveller}} 20'' by [=QuikLink=] Interactive.
37* {{D6 System}} official conversions
38** ''TabletopGame/PrimeDirective''
39* Other conversions
40** TabletopGame/{{Champions}}[=/=]Silver Age Sentinels: RealityStorm (crossover adventure with guidelines for converting material between HERO System and Tri-Stat)
41** Deadlands: ''Adios, A-Mi-Go!'' (adventure for ''Deadlands'' and ''Call of Cthulhu'' with guidelines for converting material between the systems)
42** Rifts: ''Rifts Conversion Book'' (converts material from other Palladium games for use in ''Rifts'')
43*** Pinnacle Entertainment is publishing a ''licensed'' TabletopGame/SavageWorlds conversion of Rifts.
44** Fan conversions of the ''TabletopGame/OldWorldOfDarkness'' games to the ''TabletopGame/NewWorldOfDarkness''.
45*** And now White Wolf is publishing official conversion books to celebrate the various game lines' 20th anniversaries, starting with "V20" for Vampire.
46** In the back of some old ''Villains & Vigilantes'' supplements, there were rules for converting material to and from TabletopGame/{{Champions}} and/or ''Superworld'' (Basic Roleplaying System).
47** The HERO Games magazine ''Adventurer's Club'' used to regularly include articles that gave guidelines for converting material from other systems into TabletopGame/{{Champions}}[=/=]HERO, including Creator/{{TSR}}'s ''TabletopGame/MarvelSuperHeroes'' RPG and the ''TabletopGame/DCHeroes'' RPG.
48** Paizo's website has a forum dedicated to fan conversions to their ''TabletopGame/{{Pathfinder}}'' system. This can range from the minimal (discussing what changes a specific [[TabletopGame/DungeonsAndDragons 3.5]] feat might need to fit with Pathfinder's balancing) to the more extensive (discussing conversions of entire settings).
49** Enworld's [[http://www.enworld.org/creaturecatalog/Conversions/(%20CCIndex%20).htm Creature Catalog]] contains monsters from older ''TabletopGame/DungeonsAndDragons'' converted to the d20 system.

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