How to Play

Arrange the mirrors so each coloured laser reaches the detector with the same colour.

• Beams move through the grid in the four cardinal directions.
• Walls block a beam from crossing that cell edge.
• Beams can pass through each other.
• A beam that hits the wrong detector is blocked.
• Coloured mirrors reflect only the matching laser colour; other lasers pass straight through.

Bounce the lasers to the detectors


Example of lasers interacting with coloured mirrors. The red goes straight through blue mirrors and vice versa.

Mirror Types

Mirrors on circular tiles are rotatable. Tap or click it on the board to rotate 90 degrees.

Mirrors on square tiles are not rotatable. They are always aligned as they are shown in the tray.

Some mirrors are reflective on both sides

Some mirrors are coloured and only bounce lasers of the same colour

Mirrors always lie diagonally within a cell, even when rotated.

Scoring

When you have lit all the detectors your layout will be scored:

• +1 point for each cell a laser travels through.
• +2 points each time a laser bounces off a mirror.
• −1 point for each mirror you use.

Working layouts are submitted automatically, but the game doesn't stop, you can keep moving mirrors around for as long as you like to try to find a better score.
Higher scores automatically replace your previous best for the day.
Leaderboard entries are ranked first by score, then by time taken

Long routes with few mirrors score best.
Hint: If you can hit both faces of a double-sided mirror, you get points for the reflection without placing an extra mirror.