What TTRPG should I use for a fantasy dungeon crawl?

Start from the dungeon you want, not the system you know

Most groups asking this question know D&D, so they picture heroic characters, balanced encounters, and spells that behave. That is one kind of dungeon crawl, and several games below deliberately produce a different one: expeditions measured in torches rather than hit points, magic that scars the caster, or parties where half the characters die before reaching first level. The engine decides which of those evenings you get, so match it to the crawl before comparing rulebooks.

The comparison points that actually separate these games are practical: how long a fight takes, how often characters die, how heavy the rules feel at the table, whether roles come from classes or from looser archetypes, how magic behaves when it goes wrong, and how much prep the GM carries. Work through those with the group first and the list below narrows fast.

If you want...

Each of these produces a different kind of dungeon. Find the row that describes your group's best evenings.

• Fast, dangerous old-school exploration Shadowdark. Kelsey Dionne's streamlined old-school system runs on familiar d20 bones with modern pacing, and its signature real-time torch timer turns light itself into the expedition clock: torches burn down in actual minutes, so dithering costs something tangible. Pick this when the group wants recognisable classes and genuine peril without rules overhead.
• Gonzo magic and glorious lethality Dungeon Crawl Classics. Goodman Games' system is famous for starting campaigns with a 0-level funnel, where each player runs several fragile peasants and the survivors become the party. Wizards fuel spells with spellburn, sacrificing their own strength for power, warriors improvise Mighty Deeds instead of picking feats off a list, and Luck is a spendable stat. Expect wild swings and memorable deaths.
• The dungeon as the entire campaign His Majesty the Worm. Josh McCrowell's game is built around one sprawling megadungeon: tarot cards replace dice for resolution, and food, hunger, light, and inventory management sit at the centre of play rather than in an appendix. This is the pick when the group wants crawling itself, with its routines and small daily moments, to carry the campaign.
• Very light, fast, easy to improvise EZD6. DM Scotty's system pools plain six-sided dice with boons and banes, replaces hit points with strikes, and gives players karma to spend when it matters. Nine hero paths cover the classic archetypes with almost no onboarding. The trade is depth: there is little here for players who enjoy optimising builds between sessions.
• Grim, stylish, apocalyptic doom Mörk Borg. The Stockholm Kartell game pairs a rules-light d20 core with optional classes and Omens that let players turn bad luck into something slightly better. The setting is actively ending, which gives every delve a last-days charge no encounter table can fake. Groups that want hope and heroism should look elsewhere.
• Tactical combat and deep character builds Pathfinder Second Edition or D&D itself. When the group wants grid-based set-piece fights, strongly defined classes, clearly differentiated combat and support roles, and long build arcs, the extra rules support that style of play. Accept the cost honestly: slower combat, more prep, and rules lookups as a regular feature of play.

I like D&D, but want something different

The easiest jump keeps what the group already enjoys. If that is classes, party roles, and d20 combat, Shadowdark preserves all three while cutting the rules weight and raising the stakes; the table learns it in an evening. If the draw is fast rulings and zero prep rather than familiar structure, EZD6 is the lighter break, with hero paths standing in for classes.

Dungeon Crawl Classics asks for more adjustment and repays it: the funnel resets everyone's expectations in the first session, because nobody arrives attached to a build. Whatever the group picks, keep one honest conversation for session zero: how the new game handles character death, since several of these games assume more character turnover than modern D&D.

Magic, mana pools and improvised casting

Dungeon-crawl magic splits the same way. Some tables want spells that behave: known lists, fixed costs, reliable outcomes. Others want magic that bends, backfires, or answers to the location, like mana pools where casting grows stronger or more chaotic. Decide which appetite the group has before choosing, because the systems sit at opposite ends.

For bending magic, Dungeon Crawl Classics is the natural home: spellburn already trades the caster's body for power, so house rules like volatile mana pools slot straight into logic the game teaches. EZD6 absorbs the same kind of improvisation through flexible casting where the conjurer sets the power level instead of picking from fixed spell lists. Shadowdark and Mörk Borg keep casting leaner and grimmer, which suits tables that want magic rare and costly rather than flexible. Match the house rule to the engine that already thinks that way.

Before you commit to a system

Work through these with the group before buying rulebooks:

• Run a first delve, ideally a funnel or starter set, before committing to a campaign; lethality and pacing show up in play, not in reviews.
• Check who is willing to run it and how much prep they will actually do, since these systems range from train-ride prep to serious planning.
• Agree on character death explicitly: how often it happens, how replacements arrive, and whether anyone at the table will hate it.
• Decide what magic should feel like: reliable tools, dangerous bargains, or grim rarity, and pick the engine that already leans that way.
• Confirm the practical constraints: budget for books, virtual tabletop support, and how much rules-teaching the group will tolerate.