Lumen's Lab: Light Puzzles

200 handcrafted light puzzles. Bend beams with mirrors, split them, and mix color where they cross. No ads, no timers, just unhurried tinkering.

Lumen's Lab is a cozy puzzle game about light. Aim a beam, bend it around corners with mirrors, split it into branches, and mix color where two beams cross. Every one of the 200 experiments is built around a single idea to discover; find it, and the whole path snaps into place.

There's no fire button. The emitters are always on, so the beams re-trace the instant you place a piece, and dragging a mirror previews the result before you let go. You're never waiting on the game; you're just tinkering with light until it does what you want.

Color is something you make, not something you pick. Red, blue, and yellow combine into purple, orange, green, and white. Targets demand an exact match, so every stray color counts, and some colors can only be made mid-air, where two beams cross.

Six ways light behaves, each introduced on its own and then woven into the rest:

• Reflectors: drop a / or \ mirror to bend a beam. Tap to flip it.
• Splitters: fan one beam into three, each branch free to take a different route.
• Color filters: strip a composite beam down to a single primary.
• Interference: where beams cross, their colors add together, or cancel when they share one.
• Beam-triggered movers: strike a pad and its linked marble rolls to its goal.
• Convergence: route two beams to arrive together so their colors sum to exactly what a target needs.

Produce an optical effect in a solution and Doc Lumens logs it in the Codex: additive mixing, destructive interference, the XOR reversal, and more.

Cozy by design: a warm plum-twilight palette, gentle music, and not a single timer or fail state. Scoring is move-based, so you can tinker as long as you like.

• 200 handcrafted levels across four phases. The first 100 are free, and a single one-time purchase unlocks the rest
• No ads, no accounts, no subscriptions, no timers
• Fully offline
• iPhone, iOS 17 or later

Thanks for playing.