Light Up Lamp Puzzle
Light Up Lamp Puzzle shows a room drawn as a grid of white floor squares and black walls. You place bulbs on the floor, and each bulb shines outward in four directions, stopping only when it reaches a wall or the edge. Light every white square to finish.
Some walls carry a number, and that number is a hard rule about bulbs next to it. Lit squares turn yellow as you go, which makes progress easy to see. You can play it straight on this page with no download.
How to play Light Up Lamp Puzzle
Light from a bulb covers the bulb's own square and travels in the four main directions until a black square or the border cuts it off. Diagonals are never lit.
Three rules must hold at once. Each floor square must glow. No bulb sits in the beam of another bulb, so two bulbs can never see each other across an open line. And a numbered wall touches exactly that many bulbs on its four sides. When all of that is true, the board flashes.
Pick 7x7, 10x10 or 14x14 from the Type menu, each at easy, tricky or hard. Easy boards can be solved without guessing. Custom adjusts the size, how many walls appear, their symmetry and the difficulty.
Controls
| Action | Keyboard | Mouse | Touch |
|---|---|---|---|
| Place or remove a bulb | Arrow keys, then Enter | Left-click a white square | Tap a white square |
| Mark a square as bulb-free | Space or I | Right-click a white square | Hold a white square |
| New game, undo, redo | N, U, R | Menu bar buttons | Menu bar buttons |
Tips
- A 4 wall needs a bulb on every side, so fill those at once. A 3 pressed against the board edge is fully decided too.
- Mark all four neighbors of every 0 wall as bulb-free before anything else.
- Look for a dark square that only one spot on the board could light. A bulb has to go on that spot.
- Use marks generously. Each one narrows where the remaining bulbs can go and makes forced squares easier to spot.
- Clashes are drawn in red. Fix them as soon as they appear, because they get harder to untangle later.
If you like Light Up Lamp Puzzle, try these
Tents and Trees PuzzlePlacing objects under neighbor rules and count clues feels close, with tents that must touch trees but never each other.
Range Shading PuzzleLines of sight matter here as well, since each number counts how many white squares it can see in straight lines.
Questions
How do numbered walls work in Light Up Lamp Puzzle?
The number counts bulbs touching that wall along its four sides. Diagonal squares do not count, and an unnumbered wall can have any number of bulbs beside it.
What do the dot marks do?
They are notes that a square cannot hold a bulb. They do not change the answer, but they keep you from second-guessing squares you have already ruled out.
Which Light Up Lamp Puzzle setting is best for beginners?
Start with the 7x7 easy grid. Easy boards never require a guess, so you can learn the main patterns before moving to tricky or hard.
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