A light routing puzzle

Beamline

Route light from the lamps to the sensors. Each sensor wants one exact colour, and you get a fixed number of pieces. Light adds the way real light does, so red and green arriving together make yellow.

Click a cell to place a mirror, again to turn it, again for a splitter, and once more to clear it. Right-click removes a piece.

Level 1 of 20

Straight through

0 of 0 placed

Controls

Keyboard
Arrows
Move between cells
Enter
Cycle the piece in a cell
1 2 3
Place /, \ or splitter
Delete
Remove a piece
Z
Undo
R
Clear the board
N, P
Next or previous level

Levels

solved solution shown

Pieces