Place light bulbs so that every white square is lit.

The rules

• A bulb lights its own square and shines up, down, left and right until it hits a black square or the edge.
• Two bulbs can never shine on each other.
• A number on a black square says exactly how many bulbs touch it on its four sides (not diagonally). Black squares without numbers can have any number of bulbs next to them.
• There is only one correct answer.

How to play

• Tap a white square once for a bulb, twice for a dot (a reminder that no bulb goes there), and a third time to clear it.
• Bulbs that shine on each other turn red. A number turns gray when it has the right count of bulbs.
• Light every square correctly to earn today’s green check.

Tip: a 4 always has bulbs on all four sides, and a 0 never has any. Start there.