How to play
On a dark winter evening the yard’s Christmas lights have gone out. They hang on a net of lights in front of a log house, and the wires show which bulbs are neighbours. When you tap a bulb, it and its four neighbours flip: a lit one goes out and a dark one lights up. Bulbs on the edges and in the corners have fewer neighbours. A level is done when every bulb is lit.
There are 30 levels, and the net grows from 3×3 bulbs to 7×7. In the first levels the dark bulbs form separate crosses that light up when you press the bulb in their middle. Later the crosses overlap, and the puzzle takes some thinking. Every level you solve lights a new light in the yard, such as a window, a string of lights on the spruce or a snow lantern, until the star shines on top of the spruce.
There is a new daily puzzle every day, the same for everyone. Solve it every day to grow your streak.
Scoring
Par is the fewest moves that solve the level. A level is worth more the bigger its net is. You get full points for solving it in par, and the more moves you use, the fewer points you get. A quick solve gives a few extra points, and each hint takes some of the level’s points.
You earn three stars for solving a level in par without a hint, and two when you use at most one and a half times par. Your score is the sum of your best results on all levels, and you can always replay an old level to improve your result.
Tips
- Light one row at a time: pressing the bulb below a dark one lights the dark one. Working down from the top like this, only the bottom row can stay dark.
- Pressing the same bulb twice puts everything back, and the order of your presses does not matter.
- A separate dark cross lights up when you press its middle bulb.
- If you get stuck, a hint shows one bulb worth pressing.
