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Dungeons & Dragons Basic Set (Holmes)

Holmes Basic Set
Low-level dungeon expeditions with fragile adventurers and treasure-driven advancement

Best For

Groups who want low-level dungeon expeditions built around mapping, cautious resource use, and treasure recovery.

Core Mechanic

Attacks and saving throws use a d20 roll that must meet or exceed the relevant table target. Attack targets depend on the defender's descending Armor Class and the attacker's level or hit dice. The referee resolves other actions through specific d6 or percentile procedures and rulings.

Diced20
System FamilyOSR
PublisherTSR Hobbies, Inc.
Year1977
ComplexityHow much there is to learn
Medium

Attacks and saving throws use short d20 tables. The main learning is in managing timed dungeon exploration and prepared spells. Referees coordinate these procedures with separate encounter and thief rolls.

AvailabilityHow you get the rules
  • Free to tryNothing freeNo free rules or starter
  • Get it nowOut of printNot sold new in print or PDF
RunnabilityWhat the book gives you to run it
  • –IndexNo back-of-book index or page-keyed reference tables
  • ✓GM guidanceA chapter on how to run the game
  • ✓Examples of playRules shown in action at the table
  • ✓Quick referenceCheat sheet or summary tables
  • –Cross-referencesRules rarely point to each other by page

3 of 5 book tools found in the core book

Highlights

  • Ten-minute turns tie searching and rest to the risk of wandering monsters.
  • Recovering treasure grants experience, rewarding expeditions that secure loot without fighting every monster.
  • Reaction rolls let encountered creatures respond with negotiation or offers of help.

Considerations

  • The core covers only the first three character levels and refers higher-level play to Advanced Dungeons & Dragons.
  • Magic-users must spend at least a day studying to regain an expended spell.
  • Poison can kill on a failed saving throw even when the initial hit is survivable.

No verified third-party publishing route found · Reviewed 2026-10-09 · Summary only, not legal advice. Check current terms before publishing. Rules license Proprietary No route to reuse the Holmes core text was verified; current SRD licenses cover their own text, and DMsGuild supports fifth-edition products.

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