We've had interminable discussions about the definition of the RPG genre; the best definition is based on three essential sets of components: characters, combat, and exploration. More precisely, we could define the crucial individual elements within those sets of components:
1. Character Progression (leveling up to become more powerful)
2. Character Customization (at least classes and attributes, though classes can be replaced by a skill-based system; party customization can substitute)
3. Equipment (weapon, armor, other things that give active or passive benefits; better equipment makes a character more powerful)
4. Inventory (items on hand that can be switched with equipment or consumed)
5. Character-Skill-Based (player chooses character’s action, but success of character’s actions depends on statistics and the game system, not the action of the player)
6. Deliberation (player has opportunity to consider character’s actions before choosing what to do; in real-time games at least a pause function)
7. Randomness (dice-rolls or something else to remove determinism)
8. Statistics (game system is coherent and transparent enough that player can weigh the numbers to gauge the chance of success in an action)
9. Exploration (Player has control over character’s movement through the gamespace and can make meaningful exploration decisions rather than follow linear path)
10. Dungeons (a mythic underworld to explore; many RPGs have only a dungeon without an overworld, but it is more difficult to be an RPG with an overworld but no dungeons)
11. Openness (players have control over their characters’ movements and objectives in the world rather than being forced into particular quests; difficult in CRPGs and fairly rare)
12. Logistics (players must manage their characters’ resources, due to inventory limitations, encumbrance, stamina/fatigue, need for food, need for water, need for sleep, realistic lighting and a day/night cycle, Vancian magic memorization, weapon/armor deterioration and repair, etc.)
Just as RPGs can be categorized by major subgenres, we can also identify RPG-adjacent genres of games, which have similarity with RPGs but are clearly distinct.
Major RPG Subgenres:
- Rogue-likes: Rogue (1980), Telengard (1982), Nethack (1987), Ancient Domains of Mystery (1994)
- Turn-Based Blobbers: Wizardry: Proving Grounds of the Mad Overlord (1981), Wizardry VI: Bane of the Cosmic Forge (1990), Might & Magic: World of Xeen (1994), Grimoire: Winged Heralds of the Exemplar (2017)
- Garriot-likes: Ultima III: Exodus (1983), Ultima IV: The Quest of the Avatar (1985), Ultima VII: The Black Gate (1992)
- Real-Time Blobbers: Dungeon Master (1987) & Chaos Strikes Back (1989), Legend of Grimrock (2012) & Legend of Grimrock II (2014), Eye of the Beholder (1991), Black Crypt (1992)
- Tactical RPG: Pool of Radiance (1988), Death Knights of Krynn (1991), and other Gold Box games, Wizard’s Crown (1986), Perihelion (1993)
- Underworld-likes: Ultima Underworld: The Stygian Abyss (1992), UU II: The Labyrinth of Worlds (1993), The Elder Scrolls II: Daggerfall (1996), King’s Field IV: The Ancient City (2002)
- JRPG: Final Fantasy VI (1994), Final Fantasy IV (1991), Final Fantasy IX (2000), Planescape: Torment (1999)
- C&C: Fallout (1997), Fallout 2 (1998), Arcanum (2001), Age of Decadence (2015)
- Open World RPGs: The Elder Scrolls III: Morrowind (2002), The Faery Tale Adventure (1986), Fallout: New Vegas (2010), Kingdom Come: Deliverance (2018)
- Action RPG: Dragon’s Dogma: Dark Arisen (2012/2013), Demon’s Souls (2009), Dark Souls (2011), Salt & Sanctuary (2016)
RPG-Adjacent Genres:
- Squad-based Tactics w/RPG elements: Jagged Alliance 2 (1999), X-Com (1994), Final Fantasy Tactics (1997), Troubleshooter: Abandoned Children (2020)
- Strategy w/RPG elements: Heroes of Might & Magic II (1996) and other HoMM games, Sword of Aragon (1989)
- Adventure w/RPG elements: Quest for Glory (1990) and sequels
- Beat-‘em-ups w/RPG elements: Dragon’s Crown (2013), Dungeons & Dragons: Tower of Doom (1994) / Dungeons & Dragons: Shadow over Mystara (1996)
- Action w/RPG elements: Deus Ex (2000), Blade of Darkness (2001), NieR: Automata (2017), Bloodstained (2019)
- MMORPGs: Everquest (1997), Ultima Online (1998)
- Person Simulator: Alter Ego (1986), Princess Maker (1991) series, Wonder Project J (1994)
- Gamebooks: Warlock of Firetop Mountain (2016), Disco Elysium (2019)
Disco Elysium is yet another example of a
CYOA with RPG elements, which is to say a
gamebook.