System family and compatibility

Best d20 System TTRPGs

d20-system TTRPGs are best for groups that like familiar rolls, character options, and adventure procedures but want a different flavor of risk or setting. Start with Dungeons & Dragons, Pathfinder 2e, Brancalonia, and Shadow of the Demon Lord as comparison points, then move down the list based on how closely your group wants to stay to the modern d20 baseline.

When comparing d20 system games, look at how closely it stays to current D&D habits, how deadly the math feels, whether classes or feats dominate play, and how easily existing d20 instincts transfer. Those details matter more than the tag itself, because two games can share a category while asking completely different things from the GM and players.

Use the top picks as anchors rather than treating the page like a simple popularity ranking. The goal is to answer the practical table question: which game will produce the kind of first session, campaign rhythm, and player buy-in your group is likely to enjoy?

A d20 label does not guarantee the same pacing, balance assumptions, or encounter style your group expects from D&D.

16 games All categories
Top picks

Best games in this category

Quick starting points if you want the clearest expressions of what d20 System games do well.

Dungeons & Dragons
Top pick

Dungeons & Dragons

Best baseline for understanding contemporary d20 play, with familiar classes, long advancement, tactical set pieces, and the largest supply of compatible adventures, tools, and player support.

Fantasy Campaign
Pathfinder 2e
Top pick

Pathfinder 2e

Best for groups that want the d20 family at its most tactically precise, with dependable encounter math, meaningful teamwork, and structured build choices across a long campaign.

Fantasy Campaign
Mutants & Masterminds
Top pick

Mutants & Masterminds

Best for seeing how far d20 can move beyond fantasy classes, giving players point-buy freedom to build original superheroes while retaining recognizable checks and campaign structure.

Superheroes Campaign
13th Age
Top pick

13th Age

Best for groups that want class-based d20 fantasy with faster dramatic momentum, distinctive characters, lighter encounter handling, and story hooks embedded in the rules.

Fantasy Campaign Cinematic
Compare

How to choose the right d20 System TTRPG

Choose by the job at the table. For d20 system TTRPGs, compare how closely it stays to current D&D habits, how deadly the math feels, whether classes or feats dominate play, and how easily existing d20 instincts transfer. If that sounds too abstract, ask what the game makes players decide in the first hour.

Use the top picks as contrasts. Dungeons & Dragons and Pathfinder 2e are useful side-by-side because they show the baseline and its more tightly systematized tactical cousin. Brancalonia and Shadow of the Demon Lord then show how far the same chassis can bend toward caper fantasy or grim acceleration.

  • Dungeons & Dragons: Start with Dungeons & Dragons when you want the defining modern d20 baseline with the broadest support ecosystem and the clearest shared language for fantasy adventure.
  • Pathfinder 2e: Start with Pathfinder 2e when you want a d20 system option that makes the category visible in play, not just in premise.
  • Brancalonia: Start with Brancalonia when you want a d20 system option that makes the category visible in play, not just in premise.
  • Shadow of the Demon Lord: Start with Shadow of the Demon Lord when you want a d20 system option that makes the category visible in play, not just in premise.

Match scope before rules. Some d20 system games are best as one-shots, some need a short arc, and some only reveal their strengths through campaign play. Decide that scope first, then choose the rules weight your group will actually tolerate.

FAQ

Questions players ask

Which d20 system TTRPG should my table try first?
Start with Dungeons & Dragons if you want the clearest modern baseline, then compare Pathfinder 2e, Brancalonia, and Shadow of the Demon Lord based on how closely they stay to current D&D habits, how deadly the math feels, whether classes or feats dominate play, and how easily existing d20 instincts transfer. The right first pick is the one that makes your next session easiest to imagine and run.
How do I choose between d20 system games?
Compare how much it resembles modern D&D, how deadly the math feels, whether classes or feats dominate play, and how easily existing d20 habits transfer. Pay special attention to what the game asks players to do repeatedly: solve tactical problems, improvise drama, manage scarce resources, investigate, build characters, or share authorship.
Are d20 system TTRPGs better for one-shots or campaigns?
That depends on the procedures. For one-shots, favor fast setup, immediate pressure, and a clear ending. For campaigns, look for advancement, changing relationships, faction or location pressure, downtime, and enough variety to keep the core activity interesting.
What should I check before pitching a d20 system TTRPG to my group?
A d20 label does not guarantee the same pacing, balance assumptions, or encounter style your group expects from D&D. Also check rules weight, safety expectations, prep load, and whether the players are excited by the actual scenes the game creates rather than only the premise.
More to compare

More d20 System TTRPGs to compare

13th Age

13th Age

13th Age keeps d20 classes, levels, attacks, defenses, and satisfying fights, then adds the Escalation Die, Icons, Backgrounds, and One Unique Thing to speed combat and connect characters to the campaign's larger powers.

Fantasy Campaign Cinematic
Pathfinder 2e

Pathfinder 2e

Pathfinder 2e keeps d20 checks, classes, levels, armor class, and saving throws, but rebuilds the family around three-action turns, four degrees of success, tightly controlled math, and extensive feat-based customization.

Fantasy Campaign
Dungeons & Dragons

Dungeons & Dragons

Dungeons & Dragons is the modern d20 reference point: roll a d20 plus modifiers against target numbers, then combine that core with classes, levels, saving throws, armor class, spells, and tactical encounters.

Fantasy Campaign
Starfinder

Starfinder

Starfinder is Paizo's science-fantasy TTRPG for crews of explorers, soldiers, mystics, and operators crossing the Pact Worlds with Pathfinder-compatible tactics, alien ancestries, and a ruleset that treats magic, firearms, hacking, and starship action as part of the same campaign.

Aliens Campaign One-Shot Friendly
Mutants & Masterminds

Mutants & Masterminds

Mutants & Masterminds takes d20-derived action checks into classless superhero design, replacing fixed fantasy packages with point-built powers, complications, defenses, and Toughness saves tailored to a specific comic-book concept.

Superheroes Campaign
Shadow of the Demon Lord

Shadow of the Demon Lord

A grim d20 fantasy-horror game by Robert J. Schwalb that mixes fast turns, brutal fights, and path-based character growth. Best for groups who want dark fantasy pressure without giving up crunchy build choices.

Dark Fantasy Campaign
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