Light Bulbs: play Akari (Light Up) online
Light Up (Akari): place light bulbs so that every white cell is lit, without two bulbs seeing each other.
Play Light BulbsFree, zero ads, no sign-up, on mobile and desktop.
How to play
Place bulbs to light every white cell: a bulb lights its row and column up to a wall, two bulbs must not see each other, and a number tells how many bulbs touch that wall.
Example
The wall marked 4 has a bulb on each of its sides. They light every white cell without seeing each other: the wall stands between them.
A full Easy grid
A real Easy grid (7 × 7), as you play it, and its solution. Same rule as the example above, only bigger.
Tips to get better
- A wall marked 4 has a bulb on every side; a wall marked 0 has none around it.
- A white cell that only one cell can still light forces a bulb on that cell.
- Cross out forbidden cells: they quickly narrow the choices around numbered walls.
What this game trains
- Logical reasoning: deduce the solution from the rules, without guessing.
- Visuospatial perception: picture shapes, positions and paths.
Levels
Easy · Hard · Expert · Hardcore — each level has its own leaderboard.
Challenge your friends
At the end of a game, send your score as a link: your friend plays exactly the same game and you compare your times. There is also a daily challenge and tournaments.