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An Echo Has No Shape

A 4-week first-person acoustic exploration and puzzle labyrinth built around a single, unchanging echolocation verb across three regions that subvert how the world answers back.

Role
Solo Game Designer & Developer
Year
2026
Stack
UnityC#Game DesignLevel Design
Play on itch.io ↗Download GDD (PDF) ↓

Official trailer for An Echo Has No Shape.

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Presence and one-verb restraintThe Rule of Three matrixSignal vs. deceptionSubjective memory synthesisTuning the 3-second silenceSightless wayfindingDesign takeaways

Project brief

At a glance
01Design goal
Sustain a multi-region first-person labyrinth on a single, unchanging echolocation input (Press E) without ability creep, combat, or non-diegetic UI.
02What I owned
Solo game design, level and labyrinth layout, C# gameplay and regional echo-state systems, diegetic wayfinding, audio-fog crossfades, and world assembly.
03Scope
4-week solo project in Unity 6 (URP) developed for Peter Brinson's course at USC around the Situated Player Role of The Traveler (World as Presence).

Delivered

  • Built a continuous ~550m × 550m sightless acoustic basin connecting a central hub and three regional labyrinths with zero HUD markers, minimaps, or loading screens.
  • Designed three distinct epistemic inversions of the same E input: adversarial signal cross-examination (Glacial Ocean), 3-stage memory synthesis (Unremembered City), and a 3.0s silence-and-reply cadence (Illusory Woods).

Overview

An Echo Has No Shape is a solo 4-week project built in Unity 6 for Peter Brinson's class at USC around the Situated Player Role of The Traveler (World as Presence). To focus the entire month on level design and systemic puzzle variation, I kept the player's action set fixed to a single button (Cast Echo on E, plus Attune on F) across three regional labyrinths where progression comes from changing how the world answers back.

  • Designed the core 1-verb loop and three regional rulesets (signal deception, multi-perspective synthesis, and silence-and-reply).
  • Assembled the ~550m × 550m continuous acoustic basin with a 4-tier sightless wayfinding stack.
  • Tuned the Illusory Woods 3.0s silence threshold and 0.35s active wave-overwrite feedback.

Why I made this

Most echolocation games treat sound as a binary flashlight in the dark: once the pulse reveals the room, the mechanic stops evolving. Here, the title is literal: an echo has no intrinsic shape of its own. Across the three regions, the player's relationship to their voice shifts from skeptical verification, to bearing witness, to relinquishing control.

Media

Full uncut playthrough across all three regions and the Golden Gate ending.
01

01 / Philosophy

Presence and one-verb restraint

In Peter Brinson's framework, narrative for the Traveler is constituted by presence: where the player walks, when they pause, and what they stop to hear determine what the world reveals. The brief called for a multicursal labyrinth that moves the player from feeling lost in wonder, to recognizing a pattern, to finding their way through interpretation.

Drawing on Samuel Beckett's sparse landscapes and Jorge Luis Borges's labyrinths, monumental ruins and stone tablets sit inside an open mist with no exposition dump. Every presence in the basin projects a voice into the void, mistaking what bounces back for the whole world.

Key visual: the Traveler's ivory-gold echo pulse colliding with the Siren's magenta interference across the abyssal basin.
02

02 / Epistemic Matrix

The Rule of Three matrix

Rather than unlocking new abilities, each region asks what assumption the player has formed about their echo and subverts it. Keeping the input identical meant every region had to recontextualize how the returning signal is read.

Design DimensionHub: Stone MonumentRegion I: Glacial OceanRegion II: Unremembered CityRegion III: Illusory Woods
Epistemological QuestionHow do I give shape to silence?Which signal in the fog is lying?Whose memory of the past is complete?What happens when I leave room to listen?
Player Habit SubvertedRelying on permanent sightTreating every lit contour as solid geometryAssuming a single observer sees the whole truthCasting echoes automatically on cooldown (5s)
Acoustic CounterpartThe Prophecy Tablet (Static Anchor)The Siren (Adversarial Emitter)Muse, Ruler, Architect (Subjective Memories)The Forest Reply (Delayed Call & Response)
Source of FrictionDisorientation in open mistDistinguishing solid ice from non-solid decoysOut-of-order attunement collapses the city stateSpeaking too soon overwrites the forest's reply
Chromatic & Fog IdentityObsidian Teal & Pale SageGlacial Slate & Siren MagentaSky Blue / Crimson / Emerald → Unified GoldDeep Pine & Verdant Green
Diegetic Lore Hint“Three silences wait in the mist...”“Not every voice across the ice wishes you to reach the shore.”“The city stands whole within the meeting of many eyes.”“The woods have opened to the voice you left room to hear.”
03

03 / Glacial Ocean

Signal vs. deception

First-person platforming across ice floes becomes routine if the echo is always reliable, and frustrating if jumps demand tight dexterity. The Glacial Ocean places the tension in evaluating where to jump rather than in physical execution.

Across two true routes and a false shortcut branch, ice floes are split into permanent anchor islands, hidden solid stepping stones revealed in white by the player's echo, and non-solid decoy floes that submerge when stepped on. Three unseen Siren emitters broadcast a magenta wave every 7 seconds that overwrites 35% of revealed ice in pink, erases 40% back into fog, and falsely lights 70% of decoys in pink, forcing players to cross-examine the Siren's song with their own voice.

Architectural level design map of the Glacial Ocean: solid anchor floes (white), hidden solid stepping stones (cyan), non-solid Siren traps (magenta dashed), and 62m Siren emitter radii.
A player-cast white echo revealing solid stepping stones in front of the twin ice spires.
Completed Glacial Ocean route illuminated in gold alongside the acoustic guide spline ribbon.
04

04 / Unremembered City

Subjective memory synthesis

The Unremembered City expresses its central theme (that history is a collection of biased, incomplete projections over a ruin) entirely through spatial layout and environmental state, with zero dialogue trees.

Attuning to the central plaza tablet reveals only the skeletal street grid (Stage 0). Three statues in separate quarters project partial historical lenses: The Muse (SW) restores sanctuary courtyards and flora, The Ruler (SE) layers imperial gates and citizen silhouettes, and The Architect (NE) restores load-bearing walls and arches. Attuning out of sequence or leaving the city collapses the chain back to fog; layering all three in sequence (0 → 1 → 2 → 3) synthesizes the city into a permanent golden state.

Architectural map of the Unremembered City showing the central plaza tablet (0) and the three witness quarters: The Muse (1, SW), The Ruler (2, SE), and The Architect (3, NE).
Stage 0 (Neutral Wave): Baseline skeletal ruins and the central plaza beacon.
Stage 1 (The Muse): Sky-blue fog, sanctuary courtyards, birds, and living flora.
Stage 2 (The Ruler): Imperial crimson fog, monumental archway, and citizen silhouettes.
Stage 3 (The Architect): Emerald fog and load-bearing structural geometry.
Stage 4 (Golden Synthesis): All three subjective perspective groups restored simultaneously.
Eye-level street perspective inside the synthesized golden city.
05

05 / Illusory Woods

Tuning the 3-second silence

In the Illusory Woods, the player's own echoes maintain the barrier. Casting a white echo illuminates pass-through illusory tree walls alongside real corridor walls, making direct junctions appear blocked. To dissolve those barriers, the player must cast an echo and wait in silence so the heart of the forest can answer back with a 400m green reply wave.

If the reply delay was too short (< 1.5s), players triggered the green reply by accident; if too long (> 5.0s), restless players pressed E again on cooldown and reset the timer. Setting the delay to 3.0s and adding a 0.35s active wave overwrite (where pressing E during the forest's 5.0s hold window carves through the green wave and snaps the illusory tree walls shut) taught the silence rule purely through systemic cause and effect.

Architectural level design map of the Illusory Woods: pass-through illusory barriers (bright green bars) block arterial junctions until dissolved by the 400m forest reply wave.
Pine corridor inside the Illusory Woods illuminated by an acoustic guide ribbon.
The southwest clearing and Sentinel Tower revealed after passing through the dissolved forest barriers.
06

06 / World Topology

Sightless wayfinding

To maintain zero HUD markers, minimaps, or loading screens, the entire ~550m × 550m acoustic basin lives inside one continuous scene around the central Stone Monument Hub.

Players orient themselves across four spatial scales: 450m golden world reverberations and sky beacons on regional completion, volumetric fog and music crossfades across regional outskirts, acoustic guide splines that shimmer when echoed, and a visibility hierarchy separating permanent landmark silhouettes from echo-revealed terrain.

Wayfinding ScaleEffective RangeDiegetic MechanismNavigational Function
1. Macro Scale150m to 450mWorld Reverberations & Sky BeaconsSweeps a 450m golden wave across the entire basin upon regional completion, orienting the player to macro-topography and distant sky beacons.
2. Meso Scale50m to 150mDual-Collider Fog & Music CrossfadesInterpolates volumetric fog color and regional music stems as the player crosses the outskirts between the outer and inner regional boundaries.
3. Micro Scale15m to 50mAcoustic Guide SplinesShimmering threads along arterial paths that activate briefly when struck by an echo, guiding transitions between the hub and regional outskirts without UI arrows.
4. Immediate Scale0m to 15mSeen vs. Unseen Visibility HierarchyPrimary landmarks retain a faint silhouette in the fog, while secondary terrain and hidden routes appear only while an echo wave passes over them.
Master World Map (~550m × 550m): the central Stone Monument Hub, nested inner and outer regional fog bounds, outskirts tablets, and connecting acoustic guide splines.
Stone Monument Hub (Initial State): A player echo sweeps across the monoliths and prophecy tablet.
Stone Monument Hub (3/3 Completion): Breaking all three regional silences unlocks the golden trilithon gate and illuminates the basin's guide splines and sky beacons.
07

07 / Retrospective

Design takeaways

1. Mechanical Restraint vs. Epistemic Variety: Keeping the player on a single E input meant progression had to come from recontextualizing how signals are read rather than expanding the action set, shifting from verification (Glacial Ocean), to synthesis (Unremembered City), to restraint (Illusory Woods).

2. Diegetic Feedback Over Text: In the Illusory Woods, tablet poetry alone did not stop players from echoing on cooldown. Adding the active wave overwrite (where a new player pulse visibly erases the forest's green reply and snaps the illusory walls shut) let players infer the 3.0s silence rule from systemic cause and effect.

3. Aligning Topology With Acoustic Rules: Each region's physical layout reinforces its mechanic: decoy floes mimic convenient shortcuts in the Glacial Ocean, three witnesses sit in separate quarters of the Unremembered City, and pass-through barriers block arterial junctions in the Illusory Woods until the player pauses to listen.

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An Echo Has No Shape key art showing player echo colliding with Siren waves

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