Interactive Design Document

Silence Keeps You Alive,
Sound Conquers Blindness.

Sessizlik Hayatta Tutar,
Ses İse Körlüğü Yener.

El Silencio Te Mantiene Vivo,
El Sonido Conquista La Ceguera.

Le Silence Vous Garde En Vie,
Le Son Conquiert La Cécité.

Stille Hält Dich Am Leben,
Klang Besiegt Die Blindheit.

沈黙は命を救い、
音は盲目を克服する。

保持安静才能生存，
声音能克服盲目。

침묵은 당신을 살리고,
소리는 눈먼 상태를 극복합니다.

Echolight is a sensory survival simulation set in absolute darkness. This panel allows you to interactively explore the game's core mechanics, mathematical foundations, and player psychology.

Start Exploring Privacy Policy

1. Core Game Loop

This section explains the core interaction loop. Echolight is built on "Risk and Reward". You must create danger to be able to see.

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Psychological Impact

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2. Sonar Physics Simulator

The propagation of sound waves is a physical equation. Test how different sound intensities and surface types affect the **Echo Energy (E)**.

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1m 10m 50m

Simulation Result

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3. Level Design: Awakening

◎

The screen is completely black. Only the sound of a water drop is heard. A faint text appears: "Touch to see." Touching emits a sonar wave.

👣

The player drags the character. Footsteps emit rhythmic waves, revealing the corridor. It feels empowering and safe.

⚠

Stepping on glass creates a loud noise. A monster awakens. The player must stop moving to become silent and invisible.

◉

The exit emits a rhythmic pulse. The player uses binaural audio to avoid the patrolling monster and reach the door.

4. Monetization & UI/UX

Our Freemium model is purely focused on experience customization, absolutely not "Pay-to-Win".

💰 Revenue Model

  • ✖ No wider vision.
  • ✖ No power to destroy enemies.
  • ✔ Sonar Palettes (Colors)
  • ✔ Premium Subscription: Flashlight

🎨 Minimalist UI

Visual communication is built on absolute black. No health bars. Heartbeat pulse on screen edges indicates danger.

5. Privacy Policy

Data Collection and Usage

Welcome to Echolight. We respect your privacy and are committed to protecting it. This privacy policy explains what information we collect and how we use it.

  • Username: We collect the username you provide solely to display it on the global Leaderboard via Apple CloudKit.
  • Purchase History: For "Eternal Light" subscription and Flashlight consumables, Apple StoreKit handles your transactions. We read your purchase history to verify your access to premium features.
  • Local Data: All your gameplay progress (current level, position) is stored locally on your device.

Third-Party Sharing

We do NOT share your data with any third-party advertisers. Your username and purchase validation are strictly processed through Apple's secure APIs.