Lumen's Lab

Bend the light.
Mix the color.

A cozy puzzle game about routing beams of light: bend them with reflectors, fan them through splitters, and mix color where beams cross. 200 handcrafted experiments, built for unhurried tinkering.

Coming soon to the App Store See how it works

iPhone · iOS 17 or later · No ads · No accounts · No timers

See how it plays

Lumen's Lab home screen: Doc Lumens at his glowing lab bench above the Continue button.

A cozy little lab

Warm plum-twilight light, soft music, and not a single timer or fail state. Doc Lumens keeps you company at the bench across 200 handcrafted experiments, each built around one clean idea.

A puzzle board where a splitter fans one beam into three branches routed to colored targets.

Split and route the light

Drop mirrors to bend a beam around corners and splitters to fan one into three. The beams are always live, so the instant you place a piece you see exactly what the light does.

Beams crossing on the board and combining into new colors, with a red-plus-blue-makes-purple legend below.

Mix color where beams cross

Where two beams meet they combine, or cancel out when they share a color. Red and blue make purple; the right crossing makes a hue no lamp did. Half the puzzle is discovering it.

The Codex screen: field observations for beam splitting, color filtering, and interference, each with a diagram and a note.

Every discovery gets logged

Stumble onto a real optical trick, additive mixing, destructive interference, the XOR reversal, and it lands in the Codex, Doc Lumens's field journal. The more you poke at the light, the more it fills in.

Six ways light behaves

Each mechanic arrives on its own, gets room to breathe, then layers into the mix. Nothing fiddly, just light doing what light does, one clean idea at a time.

Reflectors

Drop a / or \ mirror to bend a beam around corners. Tap to flip it. Rotating is free.

Splitters

Fan one beam into three: straight ahead and out to both sides. Each branch can take a different journey.

Color Filters

Strip a composite beam down to a single primary. Pick the right color and it changes what happens at the next crossing.

Interference

Where two beams cross, their colors combine, or cancel out when they share a color. Crossings make hues no emitter provides.

Beam-triggered movers

Strike a pad and its linked marble rolls across the board to its goal: light that moves matter, setting up cascades.

Convergence

Route two beams to arrive together at one target so their colors sum to exactly what it needs, like purple from red and blue.

Route the light.

Coming soon to the App Store