How Spectral Horn plays
Each level asks for a specific wavelength or composite colour. Moving the unicorn changes the origin of the beam, while rotating the horn changes the refraction angle; the two controls interact.
The beam is simulated with refraction and dispersion rather than a scripted animation. That means the puzzle rewards understanding the geometry, and the step buttons exist for fine adjustments when a drag is too coarse.
Who might enjoy it
A strong pick for players who like tinkering with systems and do not need a timer. It is less suitable if you want immediate action or a conventional story.
Controls and device requirements
Drag the unicorn body to move it and the orbit ring to rotate the horn. The step buttons nudge by 0.5 degrees; hold the beam on the sensor until it charges.
The creator lists desktop and mobile categories, and the controls are pointer-based. A larger screen makes the thin beam and sensor easier to read.
Rights and framing
Official js13kGames 2026 play page. The host sends CSP frame-ancestors 'self' https://js13kgames.com, so the game is linked out rather than embedded. Creator attribution and the official entry page are recorded; no code or art was copied.
Note: The play host restricts framing; use the creator-site button. The game is a competition entry and may be updated after the event.
What to try next
Creator, sources and verification
Editorial guide by CodeYourVibe. The game was opened and its first interaction was checked on 7 November 2026: PASS — Opened the official play page, started level 1 and dragged the orbit ring; the refracted beam moved and the sensor objective was visible. This is a real first-session check, not a full review, rating or measured playtime claim.
Availability and hosted builds can change. Suggest a correction or read how to choose a browser game.