Lumen

Lasers burn across a dark lab. Drag mirrors and splitters into their path and turn them until every target glows with exactly the colour it asks for.

How to play

Drag a gold-framed piece to any empty floor tile to move it. Drop it on another movable piece to swap them. Tap a piece to turn it a quarter turn.
Mirrors bounce a beam 90°. Splitters (dashed glass) bounce half the beam and let the other half through.
Pivots sit on a round base: they turn but can't be moved. Grey pieces are bolted down.
Targets show the colour they need around their ring. Red and blue make magenta, red and green make yellow, green and blue make cyan, and all three make white. A target fed the wrong mix stays dark.
Walls stop beams. Glass lets beams through but nothing can stand on it. A coloured gate only lets its own colour pass.
Every move counts: a drag, a swap or a turn. Solve in par moves for ★★★, within par + 3 for ★★, any solve earns ★.
Undo takes back a move and Restart resets the level. Levels open one after another; your stars stay in this browser only.
Keyboard: arrow keys move the cursor, Enter or Space picks up and drops a piece, X turns it, U or Backspace undoes, R restarts, P pauses, L opens levels, N goes to the next level, Esc cancels.

Level: — Moves: 0 Par: — Time: 0:00 Stars: 0

Pick a level to begin.

Level clear