Rules, mechanics, and systems
See how a few interacting rules can produce many situations.
Mechanics become a system when they affect one another. Reason from a rule to the behavior it enables and then to the experience it might produce. Unexpected outcomes can give players new strategies to discover. Carefully authored encounters can also sustain interest.
Concepts
- Rules and interactions
- A rule can specify an action, a state change, or a constraint. “Treasure adds weight” interacts with movement and enemy timing; it does more design work than an unrelated score counter.
- Resources and opportunity cost
- Time, health, space, attention, and money can be scarce. Track sources, uses, and competing demands. Even an unlimited item may have an opportunity cost in time or positioning.
- Feedback loops in systems
- A reinforcing loop amplifies a difference: a lead buys power that makes gaining a lead easier. A balancing loop resists it. This is different from the sounds and visual feedback shown after an input.
- Consistency and exceptions
- Predictable rules let players reason. Exceptions can create surprises, but should be communicated or learned without repeatedly breaking trust. Scripted sequences can coexist with systemic play.
In games
Factorio ↗
Increasing one production step may move the limiting factor elsewhere. Each machine’s output affects what the next machine can produce.
Civilization VI ↗
Spending production and land on one purpose changes what is available for others. A useful analysis follows those dependencies instead of listing features.
Common mistakes
- Adding mechanics that never influence existing decisions.
- Confusing random events with emergence.
- Letting advantages compound without checking whether trailing players still have worthwhile choices.
Find the consequences of one rule
- List three rules and draw arrows where they interact.
- Change one number or relationship. Predict two effects.
- Play a paper version and record what happened that you did not predict.
Done when: You can trace one rule change through at least two connected parts of the game.
Notes save in this browser.
Check your understanding
Why can a small economy adjustment change how a multiplayer match feels?
Show answer
The resource change may alter who gains power, which changes later opportunities and the chance of a comeback. Follow the interaction over time.
Sources
- MDA: A Formal Approach to Game Design and Game Research ↗ Design framework · Robin Hunicke, Marc LeBlanc & Robert Zubek · 2004