Light Up

Light Up (Akari) is a logic puzzle with simple rules and challenging solutions.

The rules are simple. Light Up is played on a rectangular grid. The grid has both black cells and white cells in it. The objective is to place light bulbs on the grid so that every white square is lit. A cell is illuminated by a light bulb if they're in the same row or column, and if there are no black cells between them. Also, no light bulb may illuminate another light bulb.
Some of the black cells have numbers in them. A number in a black cell indicates how many light bulbs share an edge with that cell.
Left click a square to place a light bulb. Right click to mark with X.

Video Tutorial

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Become a Patron

We are on a mission to make this website the largest collection of free, playable puzzles on the web. We are constantly adding new puzzle types, features, and improvements.

It is so exciting that you are interested in joining our community of puzzle-loving patrons! As a patron you will get some goodies in return (applies for all games):

The ads will disappear. The site will load faster as a result.

You will be able to go back 30 daily, 10 weekly and 5 monthly special puzzles.

A tempting "Give Up" button will appear, which will test your resistance, and eventually show the puzzle solution if you happen to click on it.

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Minimum contribution: Monthly: $1; Annual: $10