How to play Light Up
Light every corner of the room without any two bulbs shining on each other.
The rules
- Place bulbs so that every white square is lit. A bulb lights its row and column until a black square.
- No bulb may sit in another bulb's light.
- A number on a black square says exactly how many bulbs touch it, above, below, left and right.
A quick example
The 1 has one neighbour inside the grid on its row, so the bulb goes there.
Tips
- A 0 means no bulbs on any side. Mark those squares as dots.
- A number equal to its free neighbours means every one gets a bulb.
- A square nothing else can reach must hold a bulb itself.
Most puzzles take 3 to 10 minutes.
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