Logic puzzle · Light reflectionPrism,
Prism,
guide the light home.
Rotate mirrors and splitters so every beam reaches its target in the right color. Colors combine, splitters halve intensity, linked mirrors move together.
- Lit
- 0/1
- Rotations
- 0
- Par
- 1
- Level
- 01 · First reflection
RandomTutorial
Tap a mirror or splitter to rotate it
About the gameHow Prism works,
How Prism works,
in short.
- Step 01
Bend a beam.
Each puzzle starts with a colored light source firing a beam straight across the grid. Tap a mirror to rotate it; the beam bounces 90° off the new diagonal.
- Step 02
Split it in two.
A splitter lets the beam continue forward and sends a perpendicular copy off the diagonal. Each branch is half the intensity — split twice and a target may not light.
- Step 03
Combine the colors.
Red plus blue makes magenta. Aim two beams of the right colors at the same target and the target lights when the colors add up to match.
Questions
Prism questions, answered.
Prism is a light-reflection puzzle. Each level has one or more colored light sources, mirrors that bend beams 90°, splitters that duplicate beams, and targets that need to receive a specific color. Tap mirrors and splitters to rotate them; the beams update instantly. Solve the puzzle by lighting every target with the right combined color.
Click any mirror or splitter to flip its diagonal between `/` and `\`. Beams reflect off mirrors at 90° to the diagonal. Splitters do the same but also let the beam continue forward. Targets light up when the colors arriving from every contributing beam OR together to match the target's required color.
Beams use additive color mixing — the same model as on a screen. Red and green make yellow. Red and blue make magenta. Green and blue make cyan. All three together make white. A target needs every primary the icon shows: a magenta target needs both red and blue, a white target needs red, green, and blue.
Each splitter halves the intensity of every beam passing through it. A target needs incoming beams of at least 40% intensity to count their color. So one split is fine (50%), but pushing the same beam through two splitters in series (25%) leaves it too weak to register. Reflections off mirrors are loss-free; only splitters decay intensity.
They're rotation links. When two or more pieces share a dashed tether, rotating any one of them rotates the whole group together. Treat them as a single piece for planning — figure out a joint diagonal that works for all of them at once.
Some splitters and mirrors are anchored as part of the puzzle's premise — they read slightly faded and don't respond to clicks. The puzzle is set up so the rotatable pieces are the ones you need to think about. Treat fixed pieces the same way you treat walls: known constraints to plan around.
The catalog walks through the mechanics in order — one mirror, one splitter, two colors converging, linked mirrors, three colors making white, and a final level that combines everything. Each level's par is the minimum rotation count, but you're free to take more rotations on the way to the solution.
Your best rotation count for each level is stored locally in your browser. There is no leaderboard and nothing is uploaded — clearing site data resets your progress. Mid-puzzle state for the current level is also saved so you can reload the page and keep working from where you left off.
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