Rule Systems

Tabletop RPG Rule Systems - Game Mechanics & Core Rules

Explore the diverse world of tabletop RPG rule systems! From classic d20 mechanics to innovative narrative systems, discover the game engines that power your favorite roleplaying adventures. Whether you're a veteran game master or new to tabletop RPGs, understanding different rule systems helps you find the perfect game for your group.

Popular RPG Rule Systems

d20 System

The d20 System is one of the most popular RPG mechanics, powering games like Dungeons & Dragons and Pathfinder. Built around rolling a twenty-sided die and adding modifiers, this system offers tactical combat, character customization, and clear progression mechanics.

Dungeons & Dragons 5th Edition (5E) - The most popular RPG system worldwide, featuring streamlined rules and advantage/disadvantage mechanics
Pathfinder 1st & 2nd Edition - Deep character customization with extensive options for builds and tactics
d20 Modern & d20 Future - Contemporary and sci-fi adaptations of the classic d20 rules

Percentile Systems

Percentile-based systems use d100 rolls to determine success, offering intuitive probability and skill-based gameplay.

Call of Cthulhu - Horror investigation using Basic Roleplaying System (BRP)
RuneQuest - Fantasy roleplaying with detailed combat and magic systems
Warhammer Fantasy Roleplay - Grim dark fantasy with career-based advancement

Narrative & Story-Focused Systems

These systems prioritize storytelling and collaborative narrative over tactical combat simulation.

Powered by the Apocalypse (PbtA) - Player-driven narrative with moves and playbooks
Fate Core & Fate Accelerated - Aspect-based storytelling with flexible mechanics
Cortex Prime - Modular system adaptable to any genre or play style
Blades in the Dark - Heist-focused mechanics with position and effect

OSR (Old-School Renaissance)

OSR games embrace the design philosophy of early RPGs with simple rules, high lethality, and player ingenuity.

Old-School Essentials - Streamlined B/X D&D clone with modern presentation
Dungeon Crawl Classics - Gonzo fantasy with dice chain mechanics and funnel adventures
Lamentations of the Flame Princess - Weird horror fantasy with simplified rules
Swords & Wizardry - Faithful recreation of original D&D mechanics

Universal Systems

Universal systems can be adapted to any genre or setting, offering flexibility for creative game masters.

GURPS (Generic Universal RolePlaying System) - Point-buy character creation with detailed simulation
Savage Worlds - Fast, furious, and fun pulp action in any setting
Cypher System - Difficulty-based mechanics with player-facing rolls
Genesys - Narrative dice system adaptable to any genre

Specialty & Indie Systems

Innovative independent RPGs pushing the boundaries of game design.

Year Zero Engine - Stress and resource management in post-apocalyptic settings
Forged in the Dark - Crew-based gameplay with flashbacks and downtime
Kids on Bikes - Collaborative storytelling in 1980s adventure settings
Trophy - Doomed treasure hunters in a dark forest

Choosing the Right System

For Tactical Combat Fans

If you love miniatures, grid-based combat, and character optimization, consider Pathfinder 2E, D&D 5E, or 13th Age.

For Storytellers & Roleplayers

Narrative-focused players should explore Fate Core, Powered by the Apocalypse games, or Blades in the Dark.

For New Players

Beginners benefit from accessible systems like D&D 5E, Fate Accelerated, or Savage Worlds.

For Experienced Gamers

Veterans seeking depth might enjoy Pathfinder 1E, GURPS, or Burning Wheel.

Browse by Rule System

Shop our extensive collection of RPG products organized by rule system:

System-Neutral Resources

Many gaming accessories work with any rule system, including dice sets, miniatures, terrain, GM tools, and battle mats.

Find your perfect RPG system and start your next adventure!