Lumen, switch off every lamp
Monday, November 9, 2026: each lamp you touch flips along with its four neighbours. Switch off the whole grid, as fast as you can. The same grid for everyone, in three sizes.
Play your first game: your curve shows up here.
Daily challenge
Easy 5 × 5
Not played yet today.
Medium 6 × 6
Not played yet today.
Hard 7 × 7
Not played yet today.
Free run
Free run, easy 5 × 5
A new grid every game.
Free run, medium 6 × 6
A new grid every game.
Free run, hard 7 × 7
A new grid every game.
No account needed: start the clock, you play under a guest nickname and your time is ranked. Create an account whenever you like to keep your records, or sign in.
Leaderboards
Today
Nobody is ranked on this challenge yet today.
This week
Nobody is ranked yet this week.
Rules
Lumen is played on a grid of lit and dark lamps. Touching a lamp flips it and its four neighbours (above, below, left, right): a lit lamp goes off, a dark lamp lights up. Switch off the whole grid. Every grid has a solution; at the end, you see the fewest presses it took.
- The daily challenge: one grid per size (5 × 5, 6 × 6, 7 × 7), the same for everyone, renewed at midnight (Paris time). Only your first try of the day counts in the leaderboard; the next ones are practice.
- The free run: a new grid every game, up to 200 games a day; your best time of the day counts.
- The clock starts when the grid appears and does not stop, even if you leave the page. It stops when the last lamp goes off. On equal times, the fewest presses comes first.
- Week and month: each day, your rank in the daily challenge gives points (25 for the first, then 18, 15, 12, 10, 8, 6, 4, 2, 1, and 1 point for every other ranked player).
- The order of the presses does not matter, and pressing the same lamp twice cancels it out. With the keyboard: the arrows move the cursor, Space or Enter presses, Ctrl+Z takes back the last press.
Lumen: the rules in brief
A grid of lit and dark lamps: touching a lamp flips it and its four neighbours. Switch off the whole grid as fast as you can. The order of the presses does not matter, and pressing the same lamp twice cancels it out. Three daily grids, the same for everyone: your time sets your rank, the fewest moves breaks ties.
Lumen: how to get better
- Chase the lights down: for each lit lamp of a row, press the lamp right below it, and go on down to the last row. If lamps are left there, change one or two presses of the first row and chase again.
- Spot the crosses of five lit lamps: a single press in their centre switches them all off.
- A lamp pressed twice does nothing: if you go back on a press, undo it (Ctrl+Z) rather than pressing again.