There is no timer and no energy bar. Every one of the 100 levels is hand-designed around a single optical idea, and each level can be cleared in a known minimum number of moves.
How to play
- Drag an element from the tray onto the board, or tap an element and then tap an empty cell.
- Tap a placed element to rotate it 90° clockwise. Mirrors have a coated front face and a dead back face — the side matters.
- Watch the beam redraw itself after every move. Light is simulated in discrete beats, so delayed mirrors release their light one beat later.
- Match both requirements: brightness (each target has its own threshold) and colour (a target only accepts its own colour).
- Stuck? Use a hint — it places the next piece of a reference solution for you.
Optical elements
Fifteen elements appear across the 100 levels. These are the rules they obey:
- Mirror
- Mirror: the coated face bends light 90°, the back kills it. One beam only bends once on the same mirror.
- Prism
- Prism: splits white light into red, green and blue, each at 0.5.
- Filter
- Filter: tints light to its own colour and passes only that colour. Light must strike its face.
- Beam Splitter
- Beam splitter: one beam becomes two, each 0.5 — one straight on, one turning left 90°.
- Beam Combiner
- Beam combiner: same-colour light adds up, capped at 1.0; different colours are refused.
- Switch
- Switch: any light flips it on; it resets one beat after the light stops.
- Shutter
- Shutter: blocks light by default, opens only while its switch was on the previous beat.
- One-Way Mirror
- One-way mirror: bends light 90° from the coated face, passes it straight through the back.
- Storage Crystal
- Storage crystal: while empty it stores the first pure colour that hits it; when full, any light triggers a release.
- Frosted Glass
- Frosted glass: passes light straight through, dropping brightness one step.
- Focusing Lens
- Focusing lens: passes light straight through, raising brightness one step.
- Portal
- Portal: paired. Enter either end and leave the other in the same direction.
- Tinting Mirror
- Tinting mirror: bends light 90° and tints it to its own colour at the same time.
- Energy Gate
- Energy gate: passes only light of 0.5 or brighter.
- Delay Mirror
- Delay mirror: bends light 90°, but the bent beam leaves one beat later.
100 levels, 20 chapters
Every chapter teaches one element: mirrors first, then filters, prisms, splitters, combiners, lenses, one-way mirrors, portals, delay mirrors, storage crystals, shutters, energy gates and tinting mirrors. Later chapters combine them.
The Art of the Turn
- First Mirror
- Turn Around the Wall
- One Mirror, One Line
- Mirror Relay
- Three-Tier Corridor
Coloured Light
- Filtered Hue
- To Each Their Colour
- Tint Then Turn
- Two-Colour Corridor
- White Light Gallery
Taking White Light Apart
- Prism Triad
- The Blocked Arm
- Bend, Then Split
- Three Arms Home
- Tricolour Corridor
One Into Two
- Two Paths
- Half-Light Turn
- Split After the Bend
- Split and Tint
- Beam-Split Gallery
Two Into One
- Same Colour Adds
- Add a Mirror, Then Merge
- Two Arms Together
- Three Arms, One Crystal
- Merge Gallery
Focusing Lens
- Focusing Lens
- Two Brightness Tiers
- Double Focus
- Even Split
- Focus and Merge
Two Faces
- Two Faces, One Mirror
- Passing Through
- Sideways Relay
- One-Way Descent
- Two-Faced Corridor
Folded Space
- Gate Across the Wall
- Bend Into the Portal
- Mirror After the Gate
- Twin Gate Relay
- Warp Corridor
Glimmer Stone
- Dimmed to Treasure
- Bend, Then Dim
- Faint Light at the Corner
- Two Faint Beams
- Glimmer Gallery
Twin Targets
- Twin Targets, One Mind
- Bend to the Twin
- Two Bends for the Twin
- Answering from Afar
- Twin Gallery
One Beat Late
- One Beat Late
- One Bend Is All
- Two-Bend Limit
- Two Bends Upward
- Slow Walk Through the Night
Store and Release
- The Late Echo
- Echo Reversed
- Feeding the Narrow Way
- Stored at Half
- One Beam, Two Uses
Between Open and Shut
- Light First, Then Pass
- Around the Shutter
- Dimmed Behind the Gate
- Split at the Gate
- Twin Locks, Long Gate
The Brightness Gate
- Make Up the Difference
- Downward Past the Gate
- Look Up Past the Gate
- Too Much Is as Bad
- Merge Through the Gate
Bend and Tint
- Bend and Tint
- Tint and Dim
- One Tint, Two Paths
- Two Colours, Two Roads
- Tinted Through the Portal
Folding and Splitting
- Down After the Portal
- Up After the Portal
- Refill Past the Portal
- Twin Portal Relay
- Switchback Corridor
Timing Chains
- The Late Switch
- Relay to the Shutter
- Same Frame Behind the Gate
- Overexposed Behind the Gate
- Night Gate Corridor
Brightness Engineering
- Half Split, Made Up
- Above the Threshold
- Three Colours, Three Tiers
- Two Sources Merge
- Three Tiers from One Split
Colour Choreography
- Tricolour Split
- Tint on Arrival
- Filtered, Then Parted
- Filter First, Merge After
- Spectrum Corridor
End of the Spectrum
- Tint Behind the Portal
- One-Way Crossing
- Two Arms, One Mind
- Refill Behind the Gate
- End of the Spectrum
Frequently asked questions
- Is Spectra Hall free?
- Yes. All 100 levels play in the browser for free, with no account and no download.
- Do I need to know physics?
- No. Every rule is taught by a level: the first chapter is mirrors, and later elements get their own five-level chapter.
- Does progress save?
- Yes. Cleared levels and stars are stored in your browser, so you can close the tab and come back.
- Does it work on phones?
- Yes. Drag and tap both work with touch, and the board resizes to fit your screen.
- What is a perfect clear?
- Finishing a level within its par move count. Par is the true minimum, verified for every level.
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