Lumen

a daily beam

About Lumen

Lumen is a small daily puzzle. One board a day, two or three minutes of thinking, resets at midnight UTC. There are two puzzles each day: Daily feeds your streak, Challenge is bigger and harder.

How you play

A beam of light leaves the gold emitter in a fixed direction. You tap cells to place mirrors (one tap to drop /, another to flip to \, another to remove). The beam has to thread through every cyan crystal and end at the gold focus. End anywhere else — leaves the grid, dies in a purple void — and the attempt misses.

You see nothing until you fire. The whole puzzle is figuring out how the beam will bounce in your head.

Stars

Solve with par mirrors for ★★★, par+1 for ★★, more for ★. Your mirror count goes on the share card.

Everyone gets the same puzzle

Puzzles are deterministic from the UTC date. Day 1 is the same for everyone who ever opens the game, forever. So are Day 2, Day 3, Day 42. Daily and Challenge are different puzzles each day; Challenge runs on a bigger 7×7 board with more crystals and more voids.

Streaks and history

Your streak counts consecutive days you solve the Daily. Challenge is for fun — it doesn't feed the streak. The arrows at the top of the game let you go back and play any past day. Personal best is tracked per puzzle.

Built by

Built by Lumen Labs. For bug reports, feature requests, or screenshot flexes: [email protected].