Archive

Choose a date. Progress saves automatically.

✓ Completed on this device · Dates use UTC. New puzzles unlock daily.

How to play

Match every target’s color and use every piece. A wrong-color hit prevents a solve.

1. Place / rotate. Hold a placed piece to remove. Click a placed mirror to rotate it. Hold a placed piece to shake and remove it.
2. Mirror. Turns any beam 90°. Splitter. Sends the beam straight and around the corner.
3. Prism ◇. Sends light straight and changes its color: red → green → blue → red. It has no rotation.
4. Colored mirrors. Red, green, and blue mirrors reflect only their matching color; the other colors pass straight through.

Targets absorb all light. Walls and sources block light. Beams can cross; their colors do not mix. Every piece must be used. Colored mirrors must reflect their matching color at least once.

Keyboard: Tab to a socket, Enter to place or rotate, Delete to remove. Hold a placed piece until it shakes and disappears to return it to the tray. Time starts with your first move or hint and pauses when this tab is hidden. Progress saves on this device. Everyone gets the same daily puzzle by UTC date.

Puzzle workshop

Generate a reproducible puzzle, or import a puzzle JSON to check its rules and search for a unique solution.

Every generated puzzle is exhaustively checked for exactly one solution.