20 LEVELSChain Reaction Lab
Puzzle · Strategy
PUZZLE · OPTICAL LOGIC
Prism Switchyard.
Play Prism Switchyard online for free. Rotate optical mirrors, route a visible light beam and solve eight switchyards with undo and hints.
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Light conductor
Reach 700 points to unlock this local achievement.
THE IDEA
Follow the light. Turn the solution.
Light enters from the violet source on the left and must reach the diamond receiver on the right. A slash mirror and a backslash mirror send the beam in different directions. Rotate only the mirrors you need; the path redraws immediately. Each of eight charts changes source position, receiver position or reflection layout. You have a rotation budget, unlimited undo and one optional hint. Fewer rotations and avoiding a hint produce a higher score.
A tip for your next round
Work backward from the receiver: its final mirror must point the beam rightward. Then follow the illuminated path from the source to find the first incorrect turn. A loop cannot charge the receiver.
Prism Switchyard: questions and answers
Is this a timed puzzle?
No. Take as long as you need. The challenge is the rotation budget, and Undo recovers a rotation even after the budget is exhausted.
Does Hint solve a chart for me?
It points to one mirror that differs from a known solution. You still choose its rotation. Using it reduces the final chart score by 100.
WHEN YOU’RE READY FOR SOMETHING NEW
All games Keep the good times going.
20 LEVELS
NEW · FOLLOW THE RULERule Shift
Brain · Attention switching