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# Game Design Document: Echoes of the Forgotten
## 1. Executive Summary
**Title:** Echoes of the Forgotten
**Genre:** Open-world action-adventure with survival crafting elements
**Platform:** PC (Steam), PlayStation 5, Xbox Series X|S
**Engine:** Unreal Engine 5
**Elevator Pitch:** In a world where sound has become a weapon, players explore a post-collapse civilization where ancient acoustic technology reshapes reality. Craft sonic devices, navigate dynamic sound-scapes, and uncover the mystery of the Silence — a catastrophic event that wiped out 90% of human knowledge.
**Unique Selling Points:**
- Sound-based gameplay mechanics where audio frequency manipulation is the core combat and puzzle system
- Procedurally generated acoustic environments that change based on player actions
- A crafting system built around resonance, frequency, and harmonic combination
- Narrative delivered through environmental storytelling and recovered audio logs
## 2. Core Gameplay Loop
**Primary Loop (30-second):**
Player explores → discovers acoustic anomaly → tunes frequency device → resolves anomaly → collects resonance fragments → moves to next area
**Secondary Loop (30-minute):**
Establish base camp → craft/upgrade sonic equipment → venture into hostile frequency zones → gather rare harmonic materials → return to base → unlock new crafting recipes → expand exploration radius
**Tertiary Loop (Session):**
Discover new region → complete region narrative arc → defeat region's Dissonance Boss → unlock fast travel node → gain access to deeper lore fragments → piece together the Silence mystery
**Moment-to-Moment Feel:** The game should feel like a mix between Subnautica's exploration wonder and Horizon Zero Dawn's tactical combat. Every encounter rewards players who listen carefully to audio cues before engaging.
## 3. Player Progression
**Resonance Level (1-50):**
- Levels 1-10: Tutorial region, basic frequency tools, learn core mechanics
- Levels 11-25: Mid-game regions, compound harmonics, first Dissonance Bosses
- Levels 26-40: Advanced acoustic manipulation, multi-frequency combat
- Levels 41-50: Endgame content, mastery challenges, New Game+ modifiers
**Skill Trees (3 branches):**
- **Harmonist:** Healing, shields, ally buffs — support-oriented
- **Disruptor:** Offensive frequencies, area damage, crowd control
- **Resonant:** Exploration tools, crafting bonuses, stealth capabilities
Each branch has 20 nodes. Players can fill approximately 1.5 branches by level 50, encouraging build diversity and replayability.
**Equipment Progression:** 5 tiers of sonic devices (Makeshift → Tuned → Calibrated → Resonant → Harmonic), each with 3 mod slots for frequency crystals that alter behavior.
## 4. Monetization Strategy
**Business Model:** Premium ($49.99 base, $69.99 deluxe)
**Post-Launch:** 2 paid story expansions ($19.99 each) over 18 months
**Cosmetic Store:** Optional cosmetic items only — device skins, base decorations, character outfits. No gameplay-affecting items.
**Ethical Guardrails:** No loot boxes, no FOMO-driven limited sales, all cosmetics individually purchasable with transparent pricing.
## 5. Art Direction
**Visual Style:** Stylized realism with bioluminescent accents. Think Ori and the Blind Forest's color palette applied to Horizon's scale. Sound waves visualized as shimmering particle effects.
**Reference Games:** Horizon Forbidden West (scale), Control (atmosphere), Journey (emotional tone)
**Color Language:** Safe zones use warm amber/gold tones. Hostile frequency zones shift to cool blues and harsh violets. The Silence is represented by complete desaturation.
## 6. Technical Requirements
**Engine:** Unreal Engine 5 (Nanite for environment detail, Lumen for dynamic lighting affected by sound)
**Minimum PC Specs:** RTX 2060 / RX 5700, 16GB RAM, Ryzen 5 3600
**Networking:** Single-player primary with optional 2-player co-op (dedicated servers for co-op sessions)
**Audio Engine:** Custom spatial audio middleware built on Wwise, critical for core frequency mechanics
**Target Performance:** 60fps on current-gen consoles, scalable 30-120fps on PC
## 7. Competitive Analysis
| Game | Similarity | Our Differentiation |
|------|-----------|---------------------|
| Subnautica | Exploration + crafting loop | Sound-based mechanics add tactical depth absent from Subnautica |
| Horizon Zero Dawn | Open-world combat | Audio manipulation replaces traditional ranged/melee combat |
| No Man's Sky | Procedural environments | Hand-crafted narrative regions with procedural acoustic layers |
## 8. Development Roadmap
- **Month 0-6:** Vertical slice — one complete region with full gameplay loop
- **Month 6-12:** Core systems complete — 3 regions, all skill trees, crafting pipeline
- **Month 12-18:** Content production — remaining regions, boss encounters, narrative
- **Month 18-22:** Polish, QA, optimization, accessibility features
- **Month 22-24:** Marketing push, closed beta, launch preparation
- **Launch:** Month 24
**Team Size:** 45-60 developers (15 engineering, 12 art, 8 design, 6 audio, 4 narrative, 4 QA, 2 production)
## 9. Risk Assessment
| Risk | Probability | Impact | Mitigation |
|------|------------|--------|------------|
| Audio mechanics feel gimmicky | Medium | Critical | Early playtesting from month 3, iterate on feel before committing to content |
| Scope creep on open world | High | High | Strict region-by-region greenlight process, cut before polish |
| Performance with spatial audio | Medium | High | Audio LOD system, early profiling on min-spec hardware |
| Market saturation in survival-crafting | Medium | Medium | Lean into unique audio identity in marketing, avoid "survival" label |
| Co-op desyncing audio state | Low | Medium | Authoritative server for frequency state, client-side prediction for feel |