Best Free Light Up (Akari) Game
Place bulbs so every white square is lit, no two bulbs see each other, and every number is met.
Level 1
press P to pause
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How to play
- Place a bulb. Click a white square to drop a bulb; it lights its whole row and column until a black square blocks it.
- Avoid conflicts. Never let two bulbs see each other along a clear row or column — they’ll flag red.
- Satisfy the numbers. Give each numbered black square exactly that many touching bulbs, and light every white square to win.
About Light Up (Akari)
Akari — also known as Light Up — is a satisfying illumination logic puzzle. You place light bulbs into the white squares of a grid. Each bulb shines along its entire row and column until the light is blocked by a black square, lighting up every white cell it reaches. Your job is to light up every white square while obeying two rules: no two bulbs may shine into each other, and each numbered black square must touch exactly that many bulbs on its four sides. Every grid here is generated from a real solution. Choose easy (5×5), normal (7×7) or hard (10×10). No signup.
Frequently asked questions
Click white squares to place light bulbs. Each bulb lights its entire row and column until a black square blocks the beam. You must light every white square while making sure no two bulbs shine into one another and every numbered black square has the right number of adjacent bulbs.
A number on a black square tells you exactly how many bulbs must sit in the four squares directly above, below, left and right of it. Unnumbered black squares simply block light.
Only if a black square sits between them to block the light. Two bulbs that can see each other along a clear row or column is illegal — the game highlights them in red.
You win when every white square is lit, no two bulbs see each other, and every numbered black square touches exactly its number of bulbs. The game checks continuously.
Yes. Each grid is built by placing a valid, conflict-free set of bulbs first and then deriving the clues, so a complete solution always exists. Difficulty only changes the grid size.
Completely free — no signup, no download, no paywall. The puzzle generates and runs entirely in your browser, and nothing is uploaded.
Yes. It runs in your browser, so Light Up (Akari) works on phones and tablets as well as desktop — there is no app to install.
No. Light Up (Akari) works with no signup at all; an optional free account only exists to unlock higher usage limits.
Usually just a few seconds for a typical file — Light Up (Akari) starts working the moment you give it your input.
Your input is processed in memory and never stored, so nothing is left behind once you have your result.