soojung-kang/game-design

Game Design Principles

Design thinking for engaging games.

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1. Core Loop Design

The 30-Second Test

Every game needs a fun 30-second loop:
1. ACTION → Player does something
2. FEEDBACK → Game responds
3. REWARD → Player feels good
4. REPEAT

Loop Examples

| Genre | Core Loop | |-------|-----------| | Platformer | Run → Jump → Land → Collect | | Shooter | Aim → Shoot → Kill → Loot | | Puzzle | Observe → Think → Solve → Advance | | RPG | Explore → Fight → Level → Gear |

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2. Game Design Document (GDD)

Essential Sections

| Section | Content | |---------|---------| | Pitch | One-sentence description | | Core Loop | 30-second gameplay | | Mechanics | How systems work | | Progression | How player advances | | Art Style | Visual direction | | Audio | Sound direction |

Principles

• Keep it living (update regularly)
• Visuals help communicate
• Less is more (start small)

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3. Player Psychology

Motivation Types

| Type | Driven By | |------|-----------| | Achiever | Goals, completion | | Explorer | Discovery, secrets | | Socializer | Interaction, community | | Killer | Competition, dominance |

Reward Schedules

| Schedule | Effect | Use | |----------|--------|-----| | Fixed | Predictable | Milestone rewards | | Variable | Addictive | Loot drops | | Ratio | Effort-based | Grind games |

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4. Difficulty Balancing

Flow State

Too Hard → Frustration → Quit
Too Easy → Boredom → Quit
Just Right → Flow → Engagement

Balancing Strategies

| Strategy | How | |----------|-----| | Dynamic | Adjust to player skill | | Selection | Let player choose | | Accessibility | Options for all |

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5. Progression Design

Progression Types

| Type | Example | |------|---------| | Skill | Player gets better | | Power | Character gets stronger | | Content | New areas unlock | | Story | Narrative advances |

Pacing Principles

• Early wins (hook quickly)
• Gradually increase challenge
• Rest beats between intensity
• Meaningful choices

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6. Anti-Patterns

| ❌ Don't | ✅ Do | |----------|-------| | Design in isolation | Playtest constantly | | Polish before fun | Prototype first | | Force one way to play | Allow player expression | | Punish excessively | Reward progress |

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Remember: Fun is discovered through iteration, not designed on paper.

When to Use

This skill is applicable to execute the workflow or actions described in the overview.