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Codes and Conventions of Simulation Games: A Designer's Guide

Simulation games model real-world (or fictional) systems through abstraction, feedback, and player agency. These design conventions create the genre's identity:

1. Core Mechanical Conventions

Abstraction Layers: Complex systems (economy, physics, biology) simplified into tractable variables (resources, sliders, rates). Example: Cities: Skylines abstracts traffic flow into pathfinding + capacity, not per-car physics.
Feedback Loops: Immediate, visible consequences for player actions (profit/loss, population change, temperature rise). Reinforces mental model.
Emergent Gameplay: Simple rules interacting to produce complex, unscripted outcomes (traffic jams, market crashes, ecosystem collapse).
Time Management: Real-time with pause, accelerated time, or turn-based. Forces prioritization and planning.
Resource Chains: Input → Process → Output → Reinvestment. Core progression loop.

2. Visual & Aural Conventions

Diegetic UI: Data overlaid on world (heat maps, flow arrows, citizen thought bubbles) rather than separate screens.
Scale Indicators: Zoom levels from macro (region) to micro (individual agent/building).
Audio Cues: Ambient simulation hums, alert stingers, satisfying "cash register" sounds for positive events.
Consistent Aesthetic: Clean, readable, often stylized (not photorealistic) to prioritize legibility.

3. Narrative & Structural Conventions

Scenario / Sandbox Duality: Campaign missions (guided goals) + Free Play (self-directed).
Goal Hierarchies: Short-term (balance budget this month) → Medium (unlock landmark) → Long-term (megapolis).
Choice & Consequence: Decisions cascade (zone residential → traffic → pollution → health costs).
Disaster/Event Systems: Random or triggered challenges (fires, strikes, meteor strikes) test resilience.

4. Sub-Genre Conventions

Sub-Genre	Core Focus	Key Convention
City Builder	Zoning, infrastructure, services	Grid/road-based placement, demand indicators (RCI)
Business Tycoon	Production chains, finance, competition	Spreadsheet-like management, contract bidding
Life Sim	Agent needs, relationships, careers	Autonomous agents with motive decay, social graphs
Vehicle Sim	Physics fidelity, procedures	Checklists, checklists, checklists
Factory/Automation	Logistics, throughput, ratios	Belt/pipe networks, splitter/merger logic

5. Emerging Trends

Procedural Generation: Infinite unique maps/scenarios (Dwarf Fortress, RimWorld, Captain of Industry).
Real-World Data Integration: Live weather, traffic, economic data driving sim state (Microsoft Flight Simulator, Power Grid simulations).
Player-Generated Content: Steam Workshop, in-game editors, modding APIs extend lifespan indefinitely.
Multiplayer Persistent Sims: Shared worlds (EVE Online economy, Factorio servers, Eco).

Understanding these conventions helps designers create legible, engaging simulations—and players recognize the grammar of the genre.

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