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Types of Game Systems: Mechanics, Genres, Platforms, Engines

"Game Systems" is ambiguous. Here are the four main interpretations with clear distinctions:

1. Game Mechanics / Rule Systems (Tabletop & Design)

Dice-Based: Randomizers (d20, d6, d100) + Modifiers. D&D, Pathfinder, Warhammer, GURPS.
Card-Based: Deck-building, hand management, drafting. Magic: TG, Hearthstone, Slay the Spire, Dominion.
Narrative / Fiction-First: Moves trigger from story. Powered by the Apocalypse (PbtA), Fate, Forged in the Dark, Brindlewood Bay.
Point-Buy / Resource Pool: Spend points for actions. GURPS, Hero System, Shadowrun, Mutants & Masterminds.
Diceless / Deterministic: Resource spend / bidding. Amber, Nobilis, Microscope (some), Chess/Go.
Hybrid: Most modern games (e.g., D&D 5e = d20 + Resource (Spell Slots/HD) + Narrative (Inspiration)).

Genre	Core Loop	Examples
Role-Playing (RPG)	Character progression, narrative choice, stats	Baldur's Gate 3, Witcher 3, Elden Ring, Final Fantasy
First-Person Shooter (FPS)	Aim, movement, map control	Counter-Strike 2, Valorant, Doom Eternal, Halo
Real-Time Strategy (RTS)	Economy, macro, micro, build orders	StarCraft II, Age of Empires IV, Company of Heroes 3
Turn-Based Strategy (TBS / 4X)	Explore, Expand, Exploit, Exterminate	Civilization VI, Old World, Endless Legend, XCOM 2
Action RPG / ARPG	Loot, build, combat execution	Path of Exile, Diablo IV, Last Epoch, Grim Dawn
Simulation / Immersive Sim	Systems interaction, player agency	Factorio, Dwarf Fortress, Deus Ex, Prey, Teardown
Metroidvania	Exploration, ability-gated progression	Hollow Knight, Ori, Metroid Dread, Blasphemous
Roguelike / Roguelite	Run-based, permadeath, meta-progression	Hades, Dead Cells, Slay the Spire, Balatro, Risk of Rain 2
Sports / Racing	Physical simulation, competition	EA FC 24, F1 24, NBA 2K24, Gran Turismo 7
Puzzle	Logic, pattern, spatial reasoning	Baba Is You, Portal 2, The Witness, Tetris Effect
Horror / Survival	Resource scarcity, tension, evasion	Resident Evil 4, Alien Isolation, Subnautica, Sons of the Forest
Platformer	Jump, timing, precision	Celeste, Mario Wonder, Sonic Frontiers, Hollow Knight
Fighting	Frame data, spacing, combos	Street Fighter 6, Tekken 8, Guilty Gear Strive
MMORPG	Persistent world, social, progression	FFXIV, WoW, GW2, ESO, EVE Online

Console: PlayStation 5, Xbox Series X|S, Nintendo Switch, Steam Deck (handheld PC).
PC: Windows (Steam, Epic, GOG, EA, Battle.net, Ubisoft), Linux (Proton/SteamOS), macOS (limited).
Mobile: iOS (App Store), Android (Play Store, F-Droid, Sidequest).
Cloud: GeForce Now, Xbox Cloud, PlayStation Plus Premium, Amazon Luna.
Tabletop / Physical: Board games, Card games, TTRPGs, Miniatures, LARP.
VR / AR: Quest 2/3/Pro, PSVR2, Vision Pro, Index, Bigscreen Beyond.
Retro / Legacy: Original hardware, FPGA (MiSTer, Analogue), Emulation (RetroArch).

Engine	Language	Strengths	Notable Games
Unreal Engine 5	C++ / Blueprints	High-fidelity 3D, Nanite/Lumen, AAA, Multiplatform	Fortnite, Hellblade 2, Black Myth: Wukong, Tekken 8, Remnant 2
Unity	C#	2D/3D, Mobile, XR, Accessible, Huge Asset Store	Hades, Among Us, Genshin Impact, Vampire Survivors, Cities: Skylines II
Godot 4	GDScript / C# / C++	Free, Open Source (MIT), Lightweight, 2D King	Brotato, Cassette Beasts, The Garden Path, Dome Keeper
GameMaker	GML	2D Specialist, Fast Iteration, Console Export	Undertale, Hyper Light Drifter, Katana ZERO, Samurai Gunn 2
RPG Maker MZ / Unite	JS / Ruby	JRPG Template, Eventing, No Code Required	To the Moon, OneShot, Lisa, Corpse Party
Ren'Py	Python	Visual Novel / Narrative Specialist	Doki Doki Literature Club, VA-11 Hall-A, Heartbeat
Custom / Proprietary	C++ / Rust / C#	Max Optimization, Unique Tech	Engine (R*), Frostbite (EA), Anvil (Ubisoft), Decima (Sony), RE Engine (Capcom)

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