Daily Lumen

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Place lamps until every square of the day's room is lit, with no lamp shining on another.

Play Daily Lumen

on dailyknot.app

Today's Daily Lumen grid, Easy, with black walls numbered 0, 1 and 2 on a white board and a timer

Daily Lumen is an iPhone Light Up (Akari) puzzle with one grid a day, the same for everyone in the world. You place lamps whose light runs along rows and columns until walls stop it, lighting every square without letting two lamps see each other, while numbered walls say how many lamps touch them.

About Daily Lumen

Daily Lumen is a Light Up puzzle, also called Akari. The grid is a room of white squares and black walls. Tap an empty square to place a lamp; its light runs along the row and column until a wall stops it. The goal is to light every white square without any two lamps shining into each other. A number on a wall says exactly how many lamps sit in the squares touching it, and a 0 means none.

Every day brings one fresh grid, the same for everyone in the world, seeded by the date. The week eases in and then leans on you: Gentle on Monday, then Easy, Breezy, Medium, Tricky and Knotty, and Fiendish on Sunday. There are no wrong moves and no clock pressure.

Each grid has a par time; landing on par earns three stars and beating it up to five, with tiers named Steady, Sharp, Swift and Flawless. The result card shows stars, time and streak without revealing the solution. Freeze tokens cover missed days, banking up to three, and two optional Game Center leaderboards track daily times and the longest streak.

The daily grid and Warm-up practice are free with no ads, no account and no tracking, and Lumen+ is a one-time purchase for harder practice. It is one of the single-puzzle daily apps from the maker of Daily Knot, and came out in June 2026.

How to play Daily Lumen

Open the app and press Play today's grid.
Tap an empty square to place a lamp; its light runs along the row and column to the nearest wall.
Match every numbered wall with exactly that many lamps beside it.
Never let two lamps shine on each other.
Light every square to finish, then share your stars and time.

Screenshots

Daily Lumen's home screen: Today's Lumen, Lumen #9, Easy, everyone lights the same grid

Daily Lumen's tutorial grid with numbered walls and the rule that no two lights may see each other

Tips

Mark the squares next to a 0 wall as empty first.
A 4 wall, or a 3 against an edge, places its lamps at once.
A dark square that only one empty square can light needs a lamp there.
Lamps in long open rows rule out a lot of squares; place forced ones early.

Questions

Is the grid the same for everyone?

Yes. Everyone in the world gets the same grid each day, seeded by the date.

What are the rules?

Light every white square with lamps, keep any two lamps from seeing each other along a row or column, and put exactly the number of lamps a numbered wall shows around it.

Does it get harder through the week?

Yes, from Gentle on Monday to Fiendish on Sunday.

Is Daily Lumen free?

Yes. The daily grid and Warm-up are free with no ads; Lumen+ is an optional one-time purchase.