Personas y dados: Dice, licenses and game systems

Following with the non-official companion of Personas y dados I'm writing with this series of posts today I will talk about the type of dice used in role-playing games, the most usual licenses and some of the rulesets which can be used to create your games without having to start from scratch.

To read the review of the book you can follow this link and this other one to read the post devoted to litery and game design resources.

Tipos de dados

Dice images by Peng (Public domain) and Diacrítica (CC BY-SA 3.0)

Perhaps it's the first time you have listen about role-playing games or perhaps you have reached the blog by chance, if this is it here you have a little explanation about the most common types of dices of this kind of games, being no more than polyhedron (most of them platonic solids) that allow referees and players to obtain random numbers when throwed that, with the rulesets of the games, determine if characters are successful in what they are proposed to do.

D4 (4-sided dice)
Tetrahedron
With a pyramid shape, be careful not to step on them barefooted like a hobbit (it usually hurts a lot).

D6 (6-sided dice)
Regular hexaedron
The lifelong cubic dice, used in games like parcheesi and the goose game among others, its sides can have points or numbers although in other cases they can have other symbols or be empty (like in the case of Fudge and Fate dices, having s sides marked with the symbol +, two more with the symbol - and the other empty).

D8 (8-sided dice)
Regular octahedron
Commonly seen in nature's crystalline forms, like diamonds.

D10 (10-sided dice)
Pentagonal trapezohedron
These are usually used to make percentile rolls (with two different color dice for tens and units) and at first weren't the most common dice (although these were pattented in the USA in 1906), in fact Mike Pondsmith (author of the role-playing game Cyberpunk) explains in this thread in one of the rpg.net forums that hte first ones he used were imported from Japan being a remnant of dice used by Imperial Japanese Navy in Second World War in their wargames.

D12 (12-sided dice)
Regular dodecahedron
An intriguing example of dodecahedron, nowadays with an unknown function to us, is the Roman dodecahedron.

D20 (20-sided dice)
Regular icosahedron
The quintessential dice used in all the basic rolls of games like Dungeons & Dragons and OSR retroclones, it's also possible to find virus in nature with this shape as well as many examples of dice used in divining practices during the era of Classical Greece and Rome, like those found in the collections of the Metropolitan Museum of Art of New York (1 and 2)

Licences

Before recommending rulesets you may use as a base to create your games I think it's important to be clear about the following (and for the record, I'm not a lawyer, I'm only using common sense): one thing is to prepare a role-playing session for your friends at home or in your club, using the games you have bought and mixing concepts, mechanics and stories (something that is often done) and another very different one is what can do an author willing to use an already published game as the engine of his creation instead of his own system, having planned to obtain an economic profit selling it.

This takes us to a question that always ends appearing in role-playing games creative circles: game mechanics can be copyrighted?, are patentable? The answer is that mechanics as such can't be (you can't, for instance, pattent the idea of rolling a dice to obtain a random outcome), what can be pattented are the texts used to explain those mechanics in the game (something that Jorge Coto Bautista clearly explains in page 9 of Personas y dados), so it's usually a very bad idea to literally copy these texts in our work if you don't previously have permission from the rights owner (the author or the publisher) because you can incur in plagiarism that logically will carry many problems to the creator trying it.

What can the game designer do if he want to use mechanics of another game he likes? He have some options:

• Ask directly to the game's author to obtain his permission to do it (something relatively simple in case of independent creators).
• Explain in the game these mechanics without using the same words in the ruleset inspiring us.
• Resort to a game with mechanics available under a license allowing to reuse them.

This last point leads me to talk about of the most common types of licenses role-playing designers can use which I list below:

• Open Gaming License (OGL)
  Publisher Wizards of the Coast (Wikipedia | Website) bean to offer the third edition of Dungeons & Dragons under the Open Gaming License (OGL) v1.0 in the year 2000, allowing to all those interested to use part of the contents of the game to create supplements and derived works.
  
  This license helps to establish:
  • The Open Gaming Content (OGC) which can be reused in your creations
  • The not open content, which will be considered Product Identity (PI) and will be protected by the license chosen by the creator of the gaming material (it usually will be a closed license disallowing using it)
  
  From January 2016 Wizards of the Coast offers the 5th edition of Dungeons & Dragons under the OGL v.01a and also there are other publishers and creative groups taking advantage of this license to give others the opportunity to use his products in games creation.
• Creative Commons (CC)
  This non-profit organization (Wikipedia | Website) established in 2001 is devoted to promote access to culture and education and to expand the range of creative works on which others can legally create derived works.
  
  These licenses are constituted combining 4 modules:
  • Attribution (BY): requires a reference to the original autor of the work.
  • Share Alike (SA): allows derived works using the same license or related.
  • Non-Commercial (NC): mthe drived work must not be used with commercial purposes.
  • No Derivative Works (ND): the work can't be modified by no means.
  
  The previous modules, with the addition of the special option CC0 ("Without reserved rights"), originate the following licenses:
  • CC0 1.0 Universal (CC0 1.0)
  • Attribution (CC BY)
  • Attribution Share Alike (CC BY-SA)
  • Attribution NoDerivatives (CC BY-ND)
  • Attribution Non-Commercial (CC BY-NC)
  • Attribution Non-Commercial Share Alike (CC BY-NC-SA)
  • Attribution Non-Commercial No Derivatives (CC BY-NC-ND)
  
  

  

  File:Creative Commons Semaforoa.svg
  by Marko Txopitea "Txopi" (CC0 1.0)
  
  Copyright
  Copyleft
  Anticopyright (Criticism of Copyright)
  Free Cultural Works

• GNU licenses (GPL and GFDL)
  These licenses are promoted by the Free Software Foundation (Wikipedia | website), a non-profit foundation founded by Richard Stallman (Wikipedia | Personal website), responsilbe of the GNU Software collection (Wikipedia | Website).
  
  Although these are usually used in the free software environment (that can studied, modified and freely used for any purpose and redistributed with changes and enhancements) in some cases also came to the world of role-playing games.
  
  The licenses in its actual version are the following ones:
  • General Public License (GPL) (Wikipedia | Website): it's the license applied to software
  • GNU Free Documentation License (GFDL) (Wikipedia | Website): it's the license applied to manuals and explaining texts of software
• Other licenses
  Some publishers and creative groups had prepared their own licenses allowing to reuse the contents of their rulesets, as these depart form the general licenses I commented before and are very specific (they usually ask the interested author to contact them) I will briefly comment them when necessary.

In addition to the previous information you can also be interested in reading the following links if you want more information about this topics (you may also consult a lawyer if needed):

• Articles about copyright in rules and games:
  
  • U.S. Copyright Office: Copyright Registration of Games (FL 108) (Copy in Archive.org)
  • FAQ: Can I copyright my game?
  • Games and copyright
  • Copyright and role-playing games
  • Game Design Copyright: What You Can & Can’t Protect, and How To Protect Your Own Game
  • Can I use existing game mechanics in my own designs?
  • “Pwnership”: Is copyright appropriately equipped to handle videogames?: An evaluation of the European legal framework for the protection of creative works in video-games. (more concretely page 36 of the downloadable pdf).
  • Games and Other Uncopyrightable Systems
  • Data and copyright (concretely the question "Is a collection or compilation of different data a work?")
  • Court Rules in Favor of Cloned Tabletop Game And What It Means For You
  • The Importance of the Intellectual Property in the Gaming Industry
  • Texas court affirms game mechanics not protected under copyright law
  • MythBusting: Game Design and Copyright, Trademarks, and Patents (US Law)
  Are game mechanics/dice systems copyrighted or public domain?
• Articles about the OGL:
  
  • FAQ: Open Game License
  • Is it legal to design and publish a game with D&D's ability scores?
  • Frylock's Geekery - Part 1: Copyrightability of #RPG Stat Blocks
  • Frylock's Geekery - Part 2: Copyrightability of #RPG Abilities and Spells
  • Frylock's Geekery: Part 3 - The Damage Done by the Otherwise Ineffectual Open Gaming License
  • Frylock's Geekery - Part 3.5: A Mild Retraction That Makes Matters Worse for #WotC
  • Frylock's Geekery - Part 4: FAQ/FRI

Rulesets to use in your games

After reviewing the more usual licenses finally I offer you a list of different styles rulesets which may be used as the base of the mechanics of your games.

The following list is divided in categories regarding the type of general mechanics used and each one of the entries features the name, where these can be obtained, the language in which these are written and the license under which these are available.

There aren't all the available possibilities but there is a number more than enough to start working on your game (to see a more extense list you may read Tabletop Games (Common Content), Tabletop Games (Libre) and the games appearing listed at Sinergia de rol).

Dungeons & Dragons, D20 and OSR ◄◄◄◄

Since Wizards of the Coast began to offer version 3.1 of Dungeons & Dragons under the OGL until version 5.1, the most up-to-date version, there have been appearing many websites offering the different Source Reference Documents (SRD) explaining the basic mechanics as well as the derived ones and also a certainly important renaissance of the first versions of the game have been seen, taking advantage of said license to offer the retroclones in the Old School Renaissance (OSR) movement as well as all kind of games.

• SRD of the 5th edition of Dungeons & Dragons
  The most up-to-date Dungeons & Dragons version.
  License: OGL
  Available at:
  • Wizards of the Coast
    Language: English.
  • DND Beyond (basic rules)
    Language: English.
  • The Hypertext d20 SRD (5e d20 System Reference Document)
    Language: English.
  • 5th edition SRD
    Language: English.
  • Nosolorol
    Language: Spanish.
• SRD of previous versions of Dungeons & Dragons and similar d20 rulesets
  Previous versions of Dungeons & Dragons (3.5, etc.) as well as other implementations of d20 rulesets.
  License: OGL
  Disponible en:
  • d20 System Archive (Wizards of the Coast)
    Language: English.
  • d20srd.org
    Language: English.
  • Dungeons & Dragons Wiki
    Language: English.
  • D&D Wiki
    Language: English.
  • d20 resources
    Language: English.
  • d20 modern SRD
    Language: English.
  • 13th Age SRD
    Language: English.
  • d20 Hero SRD
    Language: English.
• Retroclones, other games and derived materials
  Games and supplemts based in different versions of Dungeons & Dragons.
  License: OGL
  
  • Principia Apocrypha
    Compilation of style "principles" usually appearing in OSR games (it's not a game as such, consider it to be a guide about what's expected to find in this kind of games).
    Languages: English | Spanish.
  • Bestioles i Brivalls by Josep Torra.
    Although the game mechanics are available under the OGL the work is entirely available under the CC BY-NC-SA 4.0 license.
    Language: Catalan.
  • Eirendor
    Although the game mechanics are available under the OGL the game universe is available under the CC BY-SA 4.0 license.
    Language: Spanish.
  • Eirendor - Ayudas
    Language: Spanish.
  • Aventura!
    Language: Spanish.
  • Aventura! - Ayudas
    Language: Spanish.
  • Labyrinth Lord: Revised Edition (no-art version)
    Also available as a download from the publisher's website.
    Language: English.
  • Advanced Edition Companion (Labyrinth Lord, no-art version)
    Also available as a download from the publisher's website.
    Language: English.
  • Mutant Future
    Also available as a download from the publisher's website.
    Language: English.
  • Apes Victorious (no art)
    Available as a download from the publisher's website.
    Language: English.
  • OSRIC
    Also available as a download from the publisher's website.
    Language: English.
  • Monsters of Myth
    Language: English.
  • Basic Fantasy RPG 3rd Edition
    Also available as a download from the publisher's website.
    Language: English.
  • Iron Falcon Rules for Classic Fantasy Role-Playing
    Language: English.
  • Swords & Wizardry Core Rules
    Also available as an online SRD.
    Language: English.
  • Dark Dungeons X
    Language: English.
  • BLUEHOLME™ Prentice Rules
    Language: English.
  • For Gold & Glory 2e Core Rules
    Language: English.
  • LotFP Rules & Magic Free Version
    Language: English.
  • LotFP Referee Book (old Grindhouse Edition)
    Language: English.
  • Ruinations of the Dust Princess
    Language: English.
  • Jernhest
    Also available as a download from the publisher's website.
    Language: Spanish.
  • Microlite20 RPG Collection (2020 Edition)
    Language: English.
  • Marte Satánico: Libro básico | Satanic Mars: Basic rulebook
    Languages: Spanish English
  • Cascade Failure
    Language: English.
  • Esper Genesis Basic Rules
    Language: English.
  • Esper Genesis Game Master's Basic Rules - FREE
    Language: English.
  • OWB001: WWII: Operation WhiteBox (FREE)
    Language: English.
  • A 5E Primer to Pistols
    Language: English.
  • A 5E Primer to Shotguns
    Language: English.
  • A 5E Primer to Rifles
    Language: English.
  • A 5E Primer to Machine Guns
    Language: English.
  • A 5E Primer to Explosives
    Language: English.
  • Vieja Escuela
    A series of games started by grapas y mapas. Although the game contents are considered OGL all the images, layout and the name Vieja Escuela (and its derivations) are considered Product Identity and are offered under CC BY-NC-SA 4.0 license.
    Below I offer some links to these games, although you also may be interested to see the list appearing in Sinergia de rol.
    • Vieja Escuela: el juego de rol
      Languages: Spanish | Catalan | Gallego | Euskera | French | Portuguese | English.
    • Catálogo ilustrado de razas singulares
      Language: Spanish.
    • Vieja Escuela Pulp!
      Languages: Spanish | catalán | English.
    • Vieja Escuela Cyberpunk
      Language: Spanish.
    • Vieja Escuela: Salvaje Oeste
      Language: Spanish.
    • Nuestro Último Verano
      Language: Spanish.
    • Vieja Ciudad
      Language: Spanish.
    • Vieja Estrella
      Language: Spanish.
    • Vieja Escuela Peplum
      Language: Spanish.
    • ¡Arrr! Vieja Escuela Piratas
      Language: Spanish.
    • Vieja Escuela Zombies
      Language: Spanish.
• Pathfinder SRD
  SRD of the role-playing game Pathfinder edited by Paizo (derived from Dungeons & Dragons 3.5).
  License: OGL
  Available at:
  • Legacy Pathfinder Reference Document
    Language: English.
  • Archives of Nethys
    Language: English.
  • d20PFSRD
    Language: English.
  • The Hypertext d20 SRD (Pathfinder Roleplaying Game Reference Document)
    Language: English.
• Dominion Rules
  This medieval fantasy game has a certain thematic resemblance to all the previous examples but its mechanics are based in 12-sided dice (d12) rolls and offer detailed combat rules.
  Insterad of being offered under the OGL the game has its own licence, the Dominion Rules Licence (DRL), allowing all people interested to distribute and modify the ruleset as wellas create derived works.
  The rules and other documents can be find in the downloads section.
  Language: English.
• Gods & Monsters
  This game is also a medieval fantastic themed one and according to the author it has a certain compatibility degree with Advanced Dungeons & Dragons 1st and 2nd editions and to the original Dungeons & Dragons.
  The GNU FDL allows all interested people to modify and distribute the game under the same license, also it can be republished using the CC-BY-SA license.
  Language: English.
Circe
To end this section we have Circe (thanks to Archive.org), another game of medieval fantasy aesthetics under GNU FDL license taht uses 10-sided dices (d10), 20-sided dices (d20) and even 30-sided dices (d30) and has a complete range of skills.
Language: English.

D100 ◄◄◄◄

Another kind of games, very popular for their mechanics, are those where characters use skills expressed as percentages (for instance: Archaeology 75%) and its use is usually resolved rolling 2 10-sided dice (d10), one for the tens and the other for the units, if a roll equal or less than the skill percentage (once modifiers due to the action difficulty are added or substracted) is obtained the playing character will be successful.

• Chaosium - Basic Roleplaying
  Subjet to the BRP Open Game License, Version 1.0 (very similar to the standard OGL), to have more information about it you may consult this link, for details about lcences (fan and commercial) you may consult this other one.
  Language: English.
• Generic Old-school Roleplaying Engine (GORE™)
  Available under the OGL license and with a free license allowing to create third parties' contents compatible with GORE™ and other games using a mechanic based in percentiles or similar.
  Language: English.
• Cthulhu d100
  Available under the OGL license, the Providence Edition is available from the downloads section of Shadowlands Ediciones and the previous edition, by Three Fourteen Games, is available from DriveThruRPG and Sinergia de rol.
  Language: Spanish.
• Mythras Imperative | Mythras Imperativo
  Document with the basic rules of the game Mythras taht can be freely downloaded and distributed, being able to be used as the base of your own games thanks to the Mythras Gateway License, to know more details of this it's necessary to get in touch with The Design Mechanism or with 77Mundos, the publisher with the license for Spain (in the download for both languages is included the neccessary contact info to deal with questions related to the license).
  Languages: English (downloads section of The Design Mechanism) | Spanish (downloads section of 77Mundos).
• Revolution D100
  Universal game system available under the OGL license.
  Language: English.
• Hardboiled
  Games system focused in police and investigation adventures, available under the CC BY-SA 4.0 license.
  Language: Spanish.
• Renaissance - D100 black powder SRD
  Free role-playing system available under the OGL for fantasy and historic games in the era of black powder weapons.
  Language: English.
• Action D100
  Universal role-playing system available under the CC BY 4.0 license.
  Language: Spanish

D6 | dice pools ◄◄◄◄

Another of the most common game systems is the one with rolls of a set of dice, frequently 6-sided dice (d6), and the sum of the results is compared with a number of difficulty that must be equalized or overcome to succeed:

• OpenD6
  OpenD6 is the heir system of the first Star Wars role-playing game, published by West End Games in 1987. After WestEnd Games was bought by Nocturnal Media and their agreement with Gallant Knight Games a development of a new version of the said ruleset is expected.
  The system was liberated under the OGL license and it's easy to find websites suplying contents (rules and pdfs) under this license, also some games simplifying or adpting its mechanics were created:
  • The openD6 Project
    Language: English.
  • OpenD6 Wiki
    Language: English.
  • OpenD6 - Open Game Content
    Language: English.
  • Crosstimbershaven.com - West End Games Open D6 Digital books
    Language: English.
  • Cinema 6
    Language: English.
  • Cinema 6 (OpenD6 wiki)
    Language: English.
  • Azamar the RPG
    Language: English.
  • Azamar the RPG - Core Supplement
    Language: English.
  • Westward Basic
    Language: English.
  • d6 magazine
    Also available as a download from the publishers's website.
    Language: English.
  • Mini Six
    Languages: English | Spanish.
  • Lil6 (free version)
    Language: English.
• Traveller and derivations
  Another of the important games, famous and with a long history behind it, is Traveller, one of the first science fiction and space voyages role-playing games. Traveller has enjoyed many editions and varaitions in many publishers, including the ocurrence of a first edition by Mongoose Publishing under the OGL license which has led to some SRD, clones and variants in what had been commonly known over the years as the 2D6 SF roleplaying:
  • Traveller SRD
    Available in the following links:
    • Traveller SRD 1.1 (OGN)
      Language: English.
    • Traveller SRD 1.1
      Language: English.
  • Cepheus Engine
    
    • Cepheus Engine SRD
      SRD available as awebsite and as a Github repository.
      Language: English.
    • Cepheus Engine System Reference Document
      Language: English.
    • Cepheus Engine SRD, Modifiable Version
      Language: English.
    • Cepheus Engine Vehicle Design System
      Language: English.
    • Cepheus: Faster Than Light!
      Language: English.
    • Cepheus: Faster Than Light, Editable Version
      Language: English.
    • Trauma Surgery for the Cepheus Engine
      Language: English.
    • Cybernetics for the Cepheus Engine
      Language: English.
    • Belting
      Language: English.
    • Near Space
      Language: English.
  • Universal Machine
    Compatible with Cepheus Engine.
    
    • Skills List (1e)
      Language: English.
    • Skills List (2e)
      Language: English.
    • Skills List (2d6)
      Language: English.
    • Advantage and Disadvantage (2e)
      Language: English.
  • Zozer Games
    Compatible with Cepheus Engine.
    
    • 1970s 2D6 RETRO RULES
      Language: English.
    • Camp Cretaceous
      Language: English.
    • Hostile Tool-Kits
      Language: English.
    • Modern War: Gun Conversion
      Language: English.
• Fudge | Fate
  Fudge, created by Stephan O'Sullivan and published in 1995 as an easy universal system, is available under OGL license with the corresponding SRD.
  • Fudge System Reference Document
    Language: English.
  • All Fudge Files
    Language: English.
  • Fudge RPG TiddlyWiki
    Language: English.
  • Fudge Lite
    Language: English.
  • Fudge On The Fly
    Language: English.
  • Fudge DS
    Language: Spanish.
  • Fudge online
    Language: Spanish.
  • Winning games of CreaFUDGE I
    
    • BOSQUE
      Language: Spanish.
    • Spirit of the Dale
      Language: Spanish.
    • HISPANIA
      Language: Spanish.
  • Other participant games in CreaFUDGE I
    Language: Spanish.
  
  Fate is a generic system created by Evil Hat Productions from the Fudge ruleset and additions to the system including among others the Aspects (a way to describe a unique quality of a character, object, place or situation). This iteration of the game is also available under many forms (Fate Accelerated, Fate Core and Fate Condensed).
  Fate is available under two type of licenses: CC BY 3.0 and OGL (the previous links take you to the many SRDs with the corrsponding license), to see an actualised 2021 guide with what can be done with the licenses you may consult the document Fate Versions Guide: Varieties, Differences, Licensing, and Recommendations (available at Evil Hat and DriveThruRPG).
  • Resources - Fate
    Downloads of Fate resources (including old versions of the rulesets).
    Language: English.
  • Fate Core - Downloads
    Updated downloads of the rulesets.
    Language: English (some of them also in Spanish).
  • Fate SRD
    Fate SRD with basic rules, from Fate Worlds and from Worlds of Adventure.
    Language: English.
  • Diaspora SRD
    Diaspora is a science fiction game allowing to create universes in which to play using the Fate rules.
    Language: English.
  • Fate SRD - Fate Condensado en español
    Also available as a download in pdf and epub.
    Language: Spanish
  • Deownloads at DrivethruRPG
    • Fate Core System | Fate Básico
      Languages: English | Spanish.
    • Fate Accelerated Edition
      Languages: English | Spanish.
    • Fate Condensed
      Language: English.
    • Fate Accelerated/Core Conversion Guide
      Language: English.
    • Fate System Toolkit
      Language: English.
    • Spirit of the Century
      Language: English | Spanish.
    • FreeFATE (English)
      Language: English.
    • Ultra Accelerated (One Page RPG)
      Language: English.
    • FREE d20 to FATE Conversion Guide
      Language: English.
  • Dwonloads at Nosolorol
    • Fate Básico (see Descargas section)
      Language: Spanish.
    • Fate Acelerado (see Descargas section)
      Language: Spanish.
• Cacería de Bichos (CdB) | Cdb Engine
  Cacería de Bichos has been created by Pablo Jaime “Zonk-PJ” Conill Querol and it's inspired by the mechanics of Fudge and Fate and it's available under the OGL license.
  
  • CdB: Manual del Cazador
    
    • Demonio Sonriente
    • Lektu
    CdB: Manual del DJ
    
    • Demonio Sonriente
    • Lektu
    CdB: Material de ayuda
    
    • Demonio Sonriente
    • Lektu
  Language: Spanish.
  
  Its successor, CdB Engine, is an universal game system with mechanics clearly inspired by 2D6 science fiction games with elements of Fate and it's available under the CC BY-SA 4.0 license.
  
  • CdB Engine: Manual del jugador
  • Cdb Engine: Manual del Director de Juego
  • CdB Engine: Manual de Equipo y Vehículos
  • CdB Engine: Ayudas de Juego
  • CdB Engine: Magia Vanciana
  • CdB Engine: Objetos Mágicos
  • CdB Engine: Combate Avanzado
  • CdB Engine: Criaturas Volumen 1
  • CdB Engine: Criaturas Volumen 2
  • CdB Engine: Criaturas Volumen 3
  Language: Spanish.
• Walküre
  Uchronic game created by Pablo Jaime “Zonk-PJ” Conill Querol and teh creative group Aventureros Errantes de la Marca del Este and offered under the CC BY-SA 4.0 license.
  
  • Walküre (Básico)
  • Mondblindheit (Suplemento)
  • Sonderaktion Rot (Suplemento)
  • Kreuzfeuer (Suplemento)
  • Sturm und Drang
  Language: Spanish.
• Powered by the Apocalypse (PbtA)
  This is a case apart of what have seen until now because the creators of the game Apocalypse World (Wikipedia | Website), D. Vincent Baker and Meguey Baker, allow designing games inspired in it without their exact wording. Therefore it's possible to find many games under the nomenclature Powered by the Apocalypse (PbtA) taking advantage of this permit as can be seen here and in the projects appearing in forums at Lumpley Games.
  And what is the basic mechanism of PbtA? Something like this:
  
  

  Roll: 2d6 + points of atribute or skill used
  10+	The playing character is succesful (even could obtain an advantage in what he wants to do later)
  7-9	The playing character achieves it, although there will be some kind of issue complicating his life a little
  6-	The playing character doesn't achive it and will be more consequences making his life very complicated

  
  
  If you want to see some examples of games following the PbtA philosophy you may consult the following links:
  
  • Apocalypse World
    The original game that initiated all of it, which the 1st version can be freely downloaded.
    Languages: English | Spanish
  • Dungeon World
    A game uniting Dungeons & Dragons with PbtA mechanics offered under the CC BY 3.0 license.
    Language: English (Downloads at Dungeon World | Downloads at Github).
  • Ironsworn
    A medieval fantastic role-playing game using 10-sided dice (d10) 6-sided dice (d6) supporting the option of gaming alone. The game is available under two type of licenses according to the type of creations we want to do: CC BY-NC-SA 4.0 for free creations (allows us to use all the book contents) and CC BY 4.0 fre commercial creations (allows us to use the contents of the SRD).
    Language: English (Website downloads | DriveThruRPG).
• Frágil
  Postapocalyptic game created by the Hermanos Juramentados de la Espada Negra and available under theCC-BY-SA 4.0 license, the rules can be read online and also generate adownloadable epub file.
  Language: Spanish.
• Rápido y Fácil
  Universal system using 10-sided dice (d10) and available under the CC BY-SA 3.0 license.
  The most up-to-date version is in the downloads section, to see the derived developments you may read the section Juegos y grupos.
  Language: Spanish.
• Year Zero Engine
  It's the system used by Fria Ligan in games like Coriolis. It's available under the OGL license and it can be downloaded from the forum of the publisher and can be found in HTML format here.
  Language: English.
• Cybersalles
  A game mixing musketeers, cyberpunk and a postapocalyptic world offered under CC BY-SA 4.0 license, it can also be downloaded from the publisher's website.
  Language: Spanish.
• Osprey
  Osprey is an universal system very similar to OpenD6, because it has 6-sided dice pools, and appears to be still in development. The game is available aunder the GPL license.
  An old version of the game can be found in this link recovered thanks Archive.org
  Language: English.

Savage Worlds ◄◄◄◄

Finally, but not less important, I will talk about the ideal system for thrilling gaming sessions looking to imitate action cinema topics: it's Savage Worlds by Pinacle Entertainment, published in Spain by HT Publishers.

Pinacle Entertainment allows to create your own material for Savage Worlds if publisher's licenses and conditions are respected:

• Conditions in English
• Conditions in Spanish

In both cases, if you want to sell your works, tou must read the conditions exposed in the Aces section.
If you are interested in the operation of Savage Worlds you also have the following downloads:

Downloads in English

• Deadlands the Weird West: Blood on the Range (Savage Worlds Test Drive #SWADE)
• Savage Worlds Test Drive (Lankhmar)
• Test Drive Savage Worlds: The Wild Hunt
• Savage Worlds Quick Combat Rules

Downloads in Spanish

• Reglas de prueba Savage Worlds

Next installment

I hope this lists of game systems and rulesets I have given you in this post will be useful when creating your own game, in the next post I will talk about software which can help role-playing designers.

This entry it's also available in the following languages:
Castellano Català